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3 years ago

Evaluate 13- (-9) need helpp

Mathematics

1 answer:

Viktor [21]3 years ago

6 0

Answer:

The answer is 22.

Explanation:

Multiply -1 by -9.

$13 + 9$

Add 13 + 9.

$22$

Therefor, the answer is 22.

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Determine which of the lines are parallel and which of the lines are perpendicular. Select all of the statements that are true.

grandymaker [24]

Answer:

Lines a and b are parallel

Lines a and c are perpendicular

Lines d and c are perpendicular

Step-by-step explanation:

we know that

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

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

Part 1) Find the slope of Line a

we have the points

(-3,4) and (3,6)

substitute in the formula

$m=\frac{6-4}{3+3}$

$m=\frac{2}{6}$

simplify

$m_a=\frac{1}{3}$

Part 2) Find the slope of Line b

we have the points

(-10,-3) and (-8,3)

substitute in the formula

$m=\frac{3+3}{-8+10}$

$m=\frac{6}{2}$

$m_b=3$

Part 3) Find the slope of Line c

we have the points

(0,5) and (3,-4)

substitute in the formula

$m=\frac{-4-5}{3-0}$

$m=\frac{-9}{3}$

$m_c=-3$

Part 4) Find the slope of Line d

we have the points

(4,-7) and (13,-4)

substitute in the formula

$m=\frac{-4+7}{13-4}$

$m=\frac{3}{9}$

simplify

$m_d=\frac{1}{3}$

Part 5) Compare the slopes

Remember that

If two lines are parallel then their slopes are the same

If two lines are perpendicular then their slopes are opposite reciprocal

we have

$m_a=\frac{1}{3}$

$m_b=3$

$m_c=-3$

$m_d=\frac{1}{3}$

therefore

Lines a and b are parallel (slopes are equal)

Lines a and c are perpendicular (slopes are opposite reciprocal)

Lines d and c are perpendicular (slopes are opposite reciprocal)

6 0

3 years ago

C. What is located at the reflection of (3,1) across

Iteru [2.4K]

Check the picture below.

6 0

2 years ago

-1/6(2x + 12) = 1/3x + 12

Hitman42 [59]

Hope this helps
X=-21

7 0

3 years ago

Which placement of grouping symbols in the expression gives it a value of 22?

Zina [86]

It is C.

First, you have to do the problem in the (), so 3*4 = (12). 12 - 2 is 10. Next, you do the other () which is 5 + 7 which is 12. 12 + 10 = 22

7 0

3 years ago

Read 2 more answers

What is the result of substituting for yin the bottom equation? y=x+3 y= x^2 + 2x - 4

marta [7]

Answer:

x +3 = x^2 +2x -4

Step-by-step explanation:

Straight substitution of the top expression for y gives you ...

x +3 = x^2 +2x -4

This lets you rewrite the equation to standard form as ...

x^2 +x -7 = 0

and find the solutions to be ...

x = (-1±√29)/2

Corresponding y-values will be 3 more than this:

y = (5±√29)/2

4 0

3 years ago