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3 years ago

Some help me with these two questions please!!!!!!!

Mathematics

1 answer:

Hatshy [7]3 years ago

8 0

Answer:

I believe #20. is A

Step-by-step explanation:

because if you use distributive property and multiply the 5 to the () numbers you will get your original question.

Also, i cant see all of the options for #21.

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It says to solve each proportion which I forgot how to do. Please help.

skelet666 [1.2K]

You have to divide denominator by numerator to find the constant of proportionality.

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3 years ago

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What 5,727 dived by 83

svetlana [45]

Answer:

415

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727

Step-by-step explanation:

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3 years ago

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Write in slope-intercept form an equation of the line that passes through the points (−1,12) and (1,2).

zzz [600]

Answer:

$y=-5x+7$

Step-by-step explanation:

step 1

Find the slope

The formula to calculate the slope between two points is equal to

$m=\frac{y2-y1}{x2-x1}$

we have

the points (−1,12) and (1,2)

substitute

$m=\frac{2-12}{1+1}$

$m=\frac{-10}{2}$

$m=-5$

step 2

we know that

The equation of the line in slope intercept form is equl to

$y=mx+b$

where

m is the slope

b is the y-intercept

we have

$m=-5$

$point\ (1,2)$

substitute in the linear equation and solve for b

$2=-5(1)+b$

$b=2+5=7$

therefore

$y=-5x+7$

4 0

3 years ago

Mr. K's math class is 14 hours long. After working problems on the board for 45 minutes (hour), he gave the students the rest of

lutik1710 [3]

If this question is typed correctly then the answer would be 13 hours and 15 minutes

5 0

2 years ago

What is the equation of the circle with center (5,-4) and containing the points (5,-2)

gtnhenbr [62]

Answer:

The equation of a circle is $(x-5)^2+(y+4)^2=4$ .

Step-by-step explanation:

-The equation of a circle is:

$(x-h)^2+(y-k)^2=r^2$ (where center is $(h,k)$ , the point $(x_{1},y_{1})$ and the radius known as $r$ ).

-Use the center (5,-4) and the point (5,-2) for the equation:

$(5-5)^2+(-2+4)^2=r^2$

-Solve the equation:

$(5-5)^2+(-2+4)^2=r^2$

$0 + (-2)^2=r^2$

$4 = r^2$

$\sqrt{4} = \sqrt{r^2}$

$2 = r$

-After you found the radius, use the center (5, -4) and radius 2 to get the equation of a circle:

$(x-5)^2+(y+4)^2=2^2$

-Then, after you have the equation, the radius needs to simplified by the exponent:

$(x-5)^2+(y+4)^2=4$

3 0

3 years ago