I need help please I don't understand this so help please ​

Answer:

The value of f(-1) in the given equation is -10.

Step-by-step explanation:

When we see f(-1), it means that -1 is represented as our value of x. So, knowing this information, we can plug this into our given equation.

f(-1) = -3(-1)² + 2(-1) - 5

Simplify the exponent on -1.

f(-1) = -3(1) + 2(-1) - 5

Multiply -3 by 1.

f(-1) = -3 + 2(-1) - 5

Multiply 2 by -1.

f(-1) = -3 - 2 - 5

Subtract 2 from -3.

f(-1) = -5 - 5

Subtract 5 from -5.

f(-1) = -10

Answer:

exactly 135 grandparents

Step-by-step explanation:

Here, it asks us for how many grandparents spend less than two hours online, which is 54% as that is what the sample result says. Now, you must what 54% of 250 is to find the number of grandparents who spend less than 2 hours. To do this, you make 54% a decimal and multiply it with 250. You do 0.54 x 250, which gives you exactly 135 grandparents who spend less than two hours online.

157.5

$5.75 x 10 = 57.5

$2.25 x 20 = 45

$5.00 x 11 = 55

then you add all them together and you get 157.5

Answer:

5x = 12

Step-by-step explanation:

Answer:

15.9

Step-by-step explanation:

Draw CE and CF

Note ∠ECD = ∠CFD and ∠D = ∠D

so ΔCED ~ ΔFCD

then ED : CD = CD : PD

CD² = ED x PD = 12 x (9 + 12) = 252

CD = 15.9

In the similarity transformation of ABC to DEF, ABC was dilated by a scale factor of [2], reflected across the [x-axis], and moved through the translation [(x-5, y+1)]

From the figure, we can see that the side lengths of the triangle DEF are twice the side lengths of ABC

This means that ABC must be dilated by a scale factor of 2

Also, both triangles are on either sides of the x-axis.

This means that ABC must be reflected across the x-axis

Lastly, the triangle must be translated 5 units left and 1 unit up

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Answer:

This is what I worked out

Answer:

ANSWER ' A '

x - 4y = 8

Step-by-step explanation:

The graph of the function is a linear function

The graph has no critical point

The points on the lines of the graphs are:

(x,y) = {(0,2) (4,0)}

Start by calculating the slope (m)

[tex]m = \frac{y_2 -y_1}{x_2 -x_1}[/tex]

So, we have:

[tex]m = \frac{0-2}{4 - 0}[/tex]

[tex]m =-0.5[/tex]

So, the linear equation is:

[tex]y = -0.5x + 2[/tex]

The above function is a linear function, and a linear function has no critical point

Hence, the graph has no critical point

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Answer: 96

Step-by-step explanation:

Answer:

Here is the answer! The person above is correct! Thanks again! Hope you have a nice day! Really helpful for k12 students!

Step-by-step explanation:

Step-by-step explanation:

when the exponent is an even number, the value is -1 and real.

when the exponent is uneven (odd), then the result is i and therefore imaginary.

i¹⁴ real

i⁴³ imaginary

i⁷ imaginary

i¹⁰ real

(4 - 5i)² = 4² - 40i + 25i² = 16 - 40i - 25 = -9 -40i imaginary

(7 + 2i)(7 - 2i) = 49 - 4i² = 49 + 4 = 53 real

Answer:

the value of expression is

given below

-6×2

=-12 Ans

Answer:

x will be equal to 1 because 1 is bigger than 0 but smaller than 2

therefore x=1

Answer:

a) The volume of the pyramid 440.44 cube units

(b) No she doesn't

(c) The volume of the larger pyramid is 1,486.485 cube units

Step-by-step explanation:

The given parameters are;

The scale factor of the pyramids, S.F. = 2:3

The base area of the small pyramid,  = 110.11 square units

The height of the small pyramid, h₁ = 12 units

(a) The volume of a pyramid, V = (1/3) × Area of base × The height of the pyramid

Therefore;

The volume of the small pyramid, V₁ = (1/3) × 110.11 square units × 12 units

V₁ = 440.44 cube units

The volume of the small pyramid, V₁ = 440.44 cube units

(b) No she does not have to go through all the hard work again to find the volume of the larger pyramid

She only has to make use of the scale factor relationships of the two pyramid to calculate the volume of the larger pyramid

The volume scale factor = (The linear scale factor)³

(c) The linear scale factor of the pyramids = 2:3 = 2/3

Therefore;

The volume scale factor of the pyramids = (2/3)³ = 8/27

To find the volume of the larger pyramid, V₂, from the volume of the smaller pyramid, V₁, we multiply the volume of the smaller pyramid, V₁,  by 27/8 as follows;

V₂ = V₁ × (27/8)

Therefore;

The volume of the larger pyramid, V₂ = 440.44 cube units × (27/8) = 1,486.485 cube units

The volume of the larger pyramid, V₂ = 1,486.485 cube units.

Answer:

Present Value A=Rs.52,488

Depreciation rate r=10% per annum

Time t=4 years

Let initial value be P

We know the formula, A=P(1−100r)t

Substituting the given values, we get.

52,488=P[1−10010]4

52,488=P(0.9)4

P=0.656152488

P=Rs.80,000

When a quadrilateral is inscribed in a circle, the opposite angles are supplementary

The description of the angles in the quadrilaterals are:

The quadrilateral is given as: JKLM

The opposite angles are:

The opposite angles are supplementary

So, we have:

[tex]J + L = 180[/tex]

[tex]K + M = 180[/tex]

Next, we test the options

Option (a)

[tex]J + L = 180[/tex]

[tex]125 + 35 = 160[/tex]

This is not true

Option (b)

[tex]J + L = 180[/tex]

[tex]48 + 132 =180[/tex]

This is true

Option (c)

[tex]K + M = 180[/tex]

[tex]12 + 78 = 180[/tex]

This is not true

Option (d)

[tex]K + M = 180[/tex]

[tex]120 + 60 = 180[/tex]

This is true

Option (e)

[tex]K + M = 180[/tex]

[tex]72 + 108= 180[/tex]

This is true

Option (f)

[tex]J + L = 180[/tex]

[tex]105 + 75 = 180[/tex]

This true

Hence, the description of the angles in the quadrilaterals are (b), (d), (e) and (f)

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Answer:

yes

Step-by-step explanation:

6.80

6.75                         8 is greater then 7 therefore 6.80 is greater

Answer:

multiple 18 x 8, then minus 6 from your answer

Answer:

1pack=6cans

18packs=x

=108canspacks=1xpack

Dividing both sides by 1 pack

X=108cans

Answer:

1.7637

Step-by-step explanation:

Welcome to 50 grams to ounces. If you have been wondering about how many ounces in 50 grams, then you are perfectly right here. 50 grams can also be written as 50 g, and the symbol for ounces is oz. In other words, this article is about the conversion of 50 g to oz, to the unit international avoirdupois ounce to be exact, but we also explain you the conversion into the international troy ounce. Read on to learn everything about 50 grams in ounces.

To change 50 g to oz divide the mass in grams by 28.349523125. The 50 grams to ounces formula is [oz] = [50] / 28.349523125. Thus, we get (all results rounded to 2 decimals):

50 g to oz = 1.76 oz

50 g to ounces = 1.76 ounces

50 grams to ounces = 1.76 oz

Fifty grams to ounces equal 1.76 international avoirdupois ounces, the unit used to measure grocery products (mass) in retail stores in the United States for example.

The result also applies to 50 g in oz for dry foods in bulk, but is not valid for liquids, whose volumes are measured in fluid ounces: 50 grams to ounces ≠ 50 grams to fluid ounces.

Finally, 50 grams to troy ounces results in 1.61 oz as the formula is [troy oz] = [50] / 31.1034768. Thus, 50 gram gold to ounces is 1.61 international troy ounces when converted.

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Answer:

55,57,59,,61,63,65,67,69,71,73,75,77,79,81,83,85,87,89,91,93,95,97

Answer:

56584653984656x9486356986455867

Step-by-step explanation:

Answer:

Step-by-step explanation:

a) 76.2 dm = 76.2 * 100 = 7620 mm

b) 2.1 km  = 2.1 *100000 = 210000

c) 0.123 Kg = 0.123 * 1000 = 123 g

d) 2.278*10¹¹ km = 2.278*10¹¹ * 10⁵ = 2.278* 10¹¹⁺⁶ = 2.278*10¹⁷ cm

e) 500 nm = 5*10⁻¹⁰ km

f) 35 mm = 35÷ 1000 = 0.035 m

g) 450 cm = 450 *10 = 4500 mm

h) 250 km = 250 * 100000 = 25000000 cm

i) 1500 micro gram = 0.0015 g

Answer:

x^2 - 1 = 0

Im not sure if this is how you want it but its one of the ways to answer this problem

Explanation:

Basically, you can do it in many ways. But just, in my opinion, exactly linear algebra was made for such cases.

the optimal way is to do it with Cramer's rule.

First, find the determinant and then find the determinant x, y, v, u.

Afterward, simply divide the determinant of variables by the usual determinant.

eg. [tex]\frac{Dx_{} }{D}[/tex] and etc.

I think that is the best way to solve it without a hustle of myriad of calculations reducing it to row echelon form and solving with Gaussian elimination.

Answer:

Step-by-step explanation:

If one angle = 90 degrees, then the other 2 added together must also = 90.

There is only 1 answer to this, since the triangle is isosceles..

x + x = 90        Combine

2x = 90            Divide by 2

x = 90/2          

x = 45

So both acute angles = 45 degrees.  

Answer:

A=90

B=-20

Step-by-step explanation:

you can see the arrow in A and B

Answer:

d. Keep the base the same and then subtract the exponents.

Step-by-step explanation:

To simplify the expression, keep the base the same and then subtract the exponents, the correct option is D.

An expression is a mathematical statement which consists of variables, constants and mathematical operators.

The expression is

[tex]\rm \dfrac{3^{-6}}{3^{-4}}[/tex]

According to the exponent rule

[tex]\rm m^a/m^b = m ^{a-b}[/tex]

3⁻⁶⁻⁽⁻⁴⁾

3⁻²

1/9

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Answer: Rational numbers have decimal expansions that repeat or terminate.

Step-by-step explanation:

The explanation of this is the non-terminating but repeating decimal expansion means that although the decimal representation has an infinite number of digits, there is a repetitive pattern to it. The rational number whose denominator is having a factor other than 2 or 5, will not have a terminating decimal number as the result.