URGENT I NEED HELP PLEASE

What is the value of this expression when a = 3 and b=-2?
2
3a06
2a-165

Answer:

6 and -8

Step-by-step explanation:

Solve:

xy = 48

x + y = -2

You can say y = -2-x = -(x+2) and then substitute that in the first:

-x(x+2) = 48

-x² -2x - 48 = 0

x² + 2x + 48 = 0

Quadratic formula can do the rest if you don't "see" the factorization.

Answer:

a+9b+10

Step-by-step explanation:

use foil method

[tex]f(x) = -5x + 2[/tex]          [tex]g(x) = \frac{1}{2}x - 4[/tex]

[tex]f(g(x)) = -5(\frac{1}{2}x - 4) + 2\\= -\frac{5}{2}x + 20 + 2\\= -\frac{5}{2}x + 22[/tex]

f(x)=-5x+2     g(x)=1/2x-4

find f(g(12))

-5(1/2x - 4) + 2

-2.5x + 20 + 2

-2.5 + 22

Hope this helps! :)

Answer:

-y² - 4y - 6

Step-by-step explanation:

Step 1: Write expression

5y² - 6y - 11 - 6y² + 2y + 5

Step 2: Combine like terms (y²)

-y² - 6y - 11 + 2y + 5

Step 3: Combine like terms (y)

-y² - 4y - 11 + 5

Step 4: Combine like terms (constants)

-y² - 4y - 6

Answer:

y=-1/5x+1

Step-by-step explanation:

divide both sides by 5: 1/5x+y=1

subtract 1/5x so y is alone since slope-intercept has y=mx+b: y=-1/5x+1

The slope-intercept form of the line x + 5y = 5 is y = - (1/5)x - 1.

We know lines have various types of equations, the general type is

Ax + By + c = 0, and equation of a line in slope-intercept form is y = mx + b.

Where slope = m and b = y-intercept.

the slope is the rate of change of the y-axis with respect to the x-axis and the y-intercept is the (0,b) where the line intersects the y-axis at x = 0.

Given, An equation of a line in the standard form x + 5y = 5.

We know the equation of the slope-intercept of the line is y = mx + b.

Therefore, The slope-intercept form of the equation x + 5y = 5 is,

5y = - x - 5.

y = - (1/5)x - 1.

learn more about lines and slopes here :

https://brainly.com/question/3605446

#SPJ2

Answer:

thats hard

Step-by-step explanation:

Answer:

She needs $30.

Step-by-step explanation:

170 minus 140 is 30.

Answer:

Step-by-step explanation:

-364 - 104 i

Answer:

I will provide the steps below.

Step-by-step explanation:

First, You will need to plug in the 8.

2(8)-(1/-3)=-5  

Multiply

16-(-1/3)=-5

If we have two negitive it turns into possitive.

16+1/3=-5

16+1/3=-5

This statement is not true becuase if y=8 the equation will be (16+1/3)=5

*Make sure your giving me the right eqution otherwise this statment is false.*

Answer:

T=2

Step-by-step explanation:

5x2=10

10+2=12

Could I please have BRAINLIEST.

Answer:

BD = 12

Step-by-step explanation:

Answer:

So we reject the null hypothesis and accept the alternate hypothesis that rats learn slower with sound.

Step-by-step explanation:

In this data we have

Mean= u = 18

X= 38

Standard deviation = s= 6

1) We formulate the null and alternate hypothesis as

H0:  u = 18  against           Ha : u > 18  One tailed test .

2) The significance level alpha = ∝= 0.05 and  Z alpha has a value ± 1.645 for one tailed test.

3)The test statistics used is

Z= X- u / s

z= 38-18/6= 3.333

4) The calculated value of z = 3.33 is greater than the z∝ = 1.645

5) So we reject the null hypothesis and accept the alternate hypothesis that rats learn slower with sound.

First we set the criteria for determining the true of value of the variable. That whether the rats learn in less or more than 18 trials.

Then we find the value of z for the given significance value given and the test about to be checked.

Then the test statistic is determined and calculated.

Then both value of z and z alpha re compared. If the test statistics falls in the rejection region  reject the null hypothesis and conclude alternate hypothesis is true.

The figure shows that the calulated z value lies outside the given z values

Answer:

3,312

lets be real who arctually looks at the step by step just use a calculator for this one

Answer:

G

Step-by-step explanation:

you just see the place value of the number you are multiplying by and you you put the place value. For example ( 3× 0.01)   is going to be ( 0.03) if it makes it easier just take the 3 and substitute it for the 1.

Hope this helped  : )

Answer:

She would need 11.1 liters of gas.

Answer:

8.48$

Step-by-step explanation:

I think

Hope this helps

Answer:

h = -8/5

Step-by-step explanation:

21 = -4h +13-h

simplify the right side

21 = -5h + 13

subtract 13

21 = -5h + 13

-13          - 13

8 = -5h

divide by -5

8 = -5h

/-5  /-5

[tex]-\frac{8}{5} = h[/tex]

Answer:

25.2

Step-by-step explanation:

14litres : 70 km

     ?     : 126km

126/70 = 1.8

14 x 1.8 = 25.2

25.2 litres of petrol

please mark as brainliest.  thank you

Answer:

25.2 litres

Step-by-step explanation:

using proportion

let the amount of petrol we are searching for be x

14litres/xlitres =70km/126km

cross multiply

70x=126×14

70x =1764

x=1764/70

x=25.2litres

Answer:

16

Step-by-step explanation:

First, we solve for x.

[tex]2x+7=-21\\2x=-28\\x=-14[/tex]

We now evaluate 2-x, plugging in -14 for x.

[tex]2-x\\2-(-14)\\2+14\\16[/tex]

12.5

2x+7=-21

2x+7-7=-21-7

2x=-28

2x/2=-28/2

x=-14

2-x=?

2-(-14)

2+14=16

Hope this helped!

Answer:

C

Step-by-step explanation:

In the graph it's curved, which is not linear, but the other lines are all straight.

Answer:

Step-by-step explanation:

Corresponding angles are equal

Answer:

Hope this helps!

Step-by-step explanation:

1- -24

2- -23

3- -2

4- 11

5- 5

6- -3

7- 28

8- 120

Answer:

14:6

Step-by-step explanation:

Answer:

f(5) = 5

Step-by-step explanation:

To evaluate f(5) , substitute x = 5 into f(x), that is

f(5) = 5² - 20 = 25 - 20 = 5

Answer:

5

Step-by-step explanation:

Subitute:

f(5) = 5^2-20

Solve:

f(5) = 5

Answer:

b) 458.9

Step-by-step explanation:

the tenths digit is the 8 right of the decimal so if you were to round, it would be 458.9 because 7 is closer to 10 than zero.

Hope this helps and can you please mark me brainliest?I just need 4 more brainliest to become expert

Answer:

The scientific notation will be Letter D

Answer:

X = 3   Y = -3

Step-by-step explanation:

The arrow is on X = 3 and the other side of arrow is on Y = -3

Hope I helped

Answer:

x=9.4

b=77.2

Step-by-step explanation:

a+b=180

as they are interior angles

(6x-48)+(4x+38)=180

6x-48+4x+38=180

6x+4x+38-48=180

10x+86=180

10x=180-86

10x=94

x=94/10

x=9.4

b=(4x+38)

b=4x+38

b=4(9.8)+38

b=39.2+38

b=77.2