Answer:
D) Not enough information is given
Step-by-step explanation:
The distribution of the amount of money spent by students on textbooks in a semester is approximately normal in shape with a mean of 434 and a standard deviation of 31. According to the standard deviation rule, approximately 99.7% of the students spent between ____$ and ______$ on textbooks in a semester.
Answer:
Hence, approximately 99.7% of students spend between : $341 and $527
Step-by-step explanation:
According to the empirical rule :
99.7% fall within 3 standard deviations from the mean
Given that :
Mean, μ = 434
Standard deviation, σ = 31
μ ± 3σ
μ - 3σ = 434 - 3(31) = 434 - 93 = 341
μ + 3σ = 434 + 3(31) = 434 + 93 = 527
Hence, approximately 99.7% of students spend between : $341 and $527 on textbooks in a semester.
Val's whole-house central air conditioner uses 3,500 watts when running. Val runs the AC 5 hours per summer day. Electricity costs (10 cents)/(1 kilowatt-hour). How much does Val's AC cost to run for a summer month of 30 days?
Answer:
$52.50.
Step-by-step explanation:
Since Val's air conditioner uses 3,500 watts when running, and that Val uses it for 5 hours during summer days, spending 10 cents per kilowatt hour, determining how much money Val will spend during a 30-day summer must be done the following calculation:
3,500 watts = 3.5 kilowatts
3.5 kilowatts per hour = 35 cents
35 cents x 5 hours = 175 cents per day
175 cents per day x 30 days = 5250 cents per month
5250/100 = X
52.5 = X
Thus, during 30 days of summer, Val will spend $ 52.50 on electricity from the use of his air conditionier.
A bricklayers union charges monthly dues of $3 plus $.18 for each hour worked during
the month. A union member's dues for July were $31.80. How many hours were worked
in July?
Answer:
160 hours
Step-by-step explanation:
y=3+.18(hours)
31.80=3+.18(hours)
28.8=.18(hours)
160=hours
glenn bought a $5 coffee and four magazines. If he spent a total of $25 how much did each magazine cost?
Answer:
5 each
Step-by-step explanation:
we will minus the coffee from the total
25 - 5 = 20
there's was 4 magazines so we do...
20 ÷ 4 = 5
Find the reciprocal for each fraction below.
4/5
4/3
1/5
5
6.
Please hurry it’s missing
Answer:
0.8
Step-by-step explanation:
Someone please help thank you
Answer:
7:12
Step-by-step explanation:
21 and 36 are both multiples of 3.
3 times 7 is 21, and 3 times 12 is 36.
Now, this ratio becomes: 3 x 7 : 3 x 12
Dividing by 3 on both sides,, we have: 7:12. The ratio 7:12 can't be simplified further, so that's the answer.
Let me know if this helps!
the answer above is correct
Mrs. Moore's third grade class wants to go on a field trip to the science museum.
-The cost of the trip is $245.
-They currently have $180 in their class field trip fund.
-The students can earn $15 each week if they run the store.
A) How much more money does the third grade class still need to earn to pay for their trip?
B) How many weeks will it take them to earn the money they need?
Answer:
hahahhahaha
Step-by-step explanation:
abahahahhahah
PLEASE HELP PLEASEEEEEE
Answer:
The answer is B. Beta Mart
Step-by-step explanation:
First you convert everything to pints. So that would be:
Alpha - 2 pints is $1
Beta - 8 pints is $3
Gamma - 1 pint is $0.54
Delta - 4 pints is $1.86
Then you find the unit rate of each. That would be:
Alpha - 1 pint is $0.50
Beta - 1 pint is $0.375(0.38)
Gamma - 1 pint is $0.54
Delta - 1 pint is $0.465(0.47)
Whichever unit rate is the least (Beta Mart) has the lowest rate. Even though it says ounces, it would still be the same answer.
4
DIRECTION: Let us determine how much you already know about the
remainder theorem and factor theorem. Read and understand each
item, then choose the letter of your answer and write it on the space
provided.
Answer:
ahor
Step-by-step explanation:
uyou 1- = 90 sio then
ok!1 so then eat balls. 40㏑≡i need help please will mark brainliest
Answer:
4 horses maybe
Step-by-step explanation:
you might subtract the 4 horses from the left to get 8 horses in the right but that's equal to 2 elephants so divide 8 by 2 to get the 1 elephant so 4 maybe
Answer: I would like to say six because for every one elephant there are two horses below it. There are twelve horses presented to the right of the equal sign.
Step-by-step explanation:
Which graph represents this system?
y=3
X+y=4
Answer:
The one in the picture is the correct option
A recipe calls for using 3/4 cup of brown sugar for each 2/3 cup of white sugar. How many cups of brown sugar are used per cup of white sugar.
The waiting times on hold for a call to a customer service department are observed to have the following probability distribution:
Number of calls, x Waiting time, minutes, f(x)
0 0
2 3
4 10
6 15
8 10
10 6
The expected value of the waiting time for a random call is most nearly: ________
a. 7.3 minutes
b. 9.2 minutes
c. 11.5 minutes
d. 15.0 minutes
Answer:
b. 9.2 minutes
Step-by-step explanation:
To find the expected waiting time for a random call from the sampie given by using the formula:
[tex]\sum (f(X)) = \dfrac{\sum f (x) \times x}{\sum x}[/tex]
number of calls (x) waiting time f(x) in minutes f(x) *(x)
0 0 0
2 3 6
4 10 40
6 15 90
8 10 80
10 6 60
[tex]\sum x = 30[/tex] [tex]\sum f(x) *x = 276[/tex]
Therefore:
[tex]\sum (f(X)) = \dfrac{276}{30}[/tex]
[tex]\sum (f(X)) = 9.2[/tex]
Three sailors weremarooned on a deserted island that was also inhabited by a band ofmonkeys. The sailors worked all day to collect coconuts but weretoo tired that night to count them. They agreed to divide them upequally the next morning.
During the night, one sailor woke up and decided to get his share.He found that he could make three equal piles, with one coconutleft over, which he threw to the monkeys. Thereupon, he had his ownshare and left the remainder in a single pile.
Later that night, the second sailor awoke, and, likewise, decidedto get his share of coconuts. He also was able to make three piles,with one coconut left, which he threw to the monkeys.
Somewhat later, the third sailor awoke and did exactly the samething with the remaining coconuts.
In the morning, all three sailors noticed that the pile wasconsiderably smaller, but each thought that he knew why and saidnothing. When they then divided the remaining coconuts equally,each sailor received seven and one was left over, which they threwto the monkeys.
How manycoconuts were in the originalpile?
Answer:
x = 690
Step-by-step explanation:
Let´s call x the number of coconuts at night ( at the original pile )
Then the first sailor took x/3 threw 1 to monkeys, therefore, number 1 sailor used x/3 + 1 and left
x - ( x/3 - 1 ) = (3x - x - 3 )/3 = ( 2x - 3 )/3
Evaluating the second sailor
He took [ ( 2x - 3 )/3]/3 ] threw 1 to monkeys
[ ( 2x - 3 )/3]/3 ] + 1 = ( 2x + 24 ) / 9
The third took
[( 2x + 24 ) / 9] /3 and threw 1 to monkeys
{ [( 2x + 24 ) / 9] /3 } + 1 = (2x + 51 )/27
Finally they divided the pile each one of them got 7 and threw 1 to monkeys
The resulting equation is:
( 2x - 3 )/3 + ( 2x + 24 ) / 9 + (2x + 51 )/27 + 21 + 1 = x
Solving for x
18x - 27 + 6x + 72 + 2x + 51 + 594 = 27x
-x = - 690
x = 690
what is the value of x?
which angle is the smallest angle
Answer:
angle c
Step-by-step explanation:
Answer:
should be angle c if im correct
Mariam has 126 pieces of chocolate and 16 pieces of hard candy. Her sister has
87 pieces of chocolate and 38 pieces of hard candy. How many pieces of
chocolate do they have in total? *
Answer:
The answer is 213.
Step-by-step explanation:
The question states "how many pieces of chocolate." Not "How much candy and chocolate in total." Therefore all I have to do is 126 (Mariams chocolate count) + 87 (Her sisters choclate count).
Good luck, I hope this helped!!
PLS ASAP I HAVE BEEN UP LATE I NEED HELP!!
Answer:
it’s the second one
Which expression is the same as 15 of 7? CLEAR CHECK 15×17 5÷7 7÷5 17 of 5
Answer:
15/7
Step-by-step explanation:
15/7
15 of 7 is the same as 15 out of 7, or 15/7
I hope this helps! :)
true or false: define event A = {1,2,3,4} and event B = {2,3,6,7}. A u B = {2,3}
Answer: Im pretty sure its True
Step-by-step explanation:
sorry if this doesnt help :(
have a great day :)
If A = {1,2,3,4} and B = {2,3,6,7}.
then, A u B = {2,3} is false
The union of two sets A and B is a set containing the elements in set A or B.
The given sets are:
A = {1,2,3,4}
B = {2,3,6,7}
A u B is the set of elements in A or B
Therefore, A u B = {1, 2, 3, 4, 6, 7}
Note that:
A ∩ B = {2, 3}, it is not A u B
Therefore, A u B = {2,3} is false
Learn more on union of sets here: https://brainly.com/question/2166579
Find the domain of the function
f(x)=[tex]\frac{1}{\sqrt{4-x} }[/tex]
write your answer in interval notation.
Answer:
The domain of f is (-∞,4)
Step-by-step explanation:
Domain of a Function
The domain of a function f is the set of all the values that the input variable can take so the function exists.
We are given the function
[tex]f(x)=\frac{1}{\sqrt{4-x} }[/tex]
It's a rational function which denominator cannot be 0. In the denominator, there is a square root whose radicand cannot be negative, that is, 4-x must be positive or zero, but the previous restriction takes out 0 from the domain, thus:
4 - x > 0
Subtracting 4:
- x > -4
Multiplying by -1 and swapping the inequality sign:
x < 4
Thus the domain of f is (-∞,4)
0.83 as a fraction
both 8 and 3 are recurring
Answer:
83/99
Step-by-step explanation:
Answer:
Now it can be seen that x is assumed to be . Therefore, the decimal is equivalent to 5/6. Answer: The decimal is converted to 5/6 as fraction
Step-by-step explanation:
It is in the picture
Answer:
a 5/2; b. 2.5; c 0.9; d. 90%
Step-by-step explanation:
Solve the equation for x: 1/4x=7
Answer:
x = 28
Step-by-step explanation:
1/4x = 7
x = 7 • 4
x= 28
the division pass to other place to multiplication
Distributive Property Practice Exercises
Exercises
1.Evaluate each of the expressions below.
c. 18m + 42n and 6(3m + 7n); m=2 and n = 6
Answer:
Yes, it is distributive.
Step-by-step explanation:
A distributive property is a rule that states that, multiplying two factors such as a binomial and trinomial would give the same result as multiplying the sum of two addends by the other factor.
Given the following data;
m = 2
n = 6
For equation 1;
18m + 42n = 18(2) + 42(6)
18m + 42n = 36 + 252
18m + 42n = 288.
For equation 2;
6(3m + 7n) = 6(3*2 + 7*6)
6(3m + 7n) = 6(6 + 42)
6(3m + 7n) = 6(48)
6(3m + 7n) = 288
18m + 42n = 6(3m + 7n) = 288
Therefore, the equation illustrates distributive property.
Select all the equations that are true when x is -4.
-8 = 2x
-12 = x• -3
- 12 = x+x+x
x + 4 = -8
x2=-16
Answer:
-8=2x and -12=x+x+x
Step-by-step explanation:
When x is -4
1). 2(-4) = -8
2). -4.-3= 12
3). (-4)+(-4)+(-4)= -12
4). -4+4= 0
5). -4²= -16
For the last equation, if the -4² was in a bracket then the answer would be 16 because (-²) would give +Please help! Will Mark brainliest!
Answer:
25
Step-by-step explanation:
i not fully sure if this is right
A company uses 3 trucks to deliver a total of T liters of cement. Each truck can transport x liters of cement per trip, and makes a total of y trips.
Write an equation that relates T, x, and y.
Answer: T=3xy
Step-by-step explanation:
Answer:
T=3xy
Step-by-step explanation:
pls no one answered this last time :( i want to be free
Answer:
The total area is 3016 square inches, approximately
Which number sentence below matches this word problem?
Alice's garden produced 17 yellow tomatoes this year. She also grew 18 roma
tomatoes. What was the total number of tomatoes she grew?
A. 18- 17 = 1
B. 17 + 18 - 35
C. 306 - 17 - 18
D. 18 x 17 = 306
