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2 years ago

Find the distance between the points (8, – 7) and ( – 4,9). Hint: Use the Pythagorean theorem

1 answer:

6 0

8+4=12
9+7=16
12^2=144
16^2=256
144+256=400
square root of 400 is 20

therefore the distance from (8, -7) to (-4,9) is 20.

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Debora [2.8K]

Answer:

x=12

Step-by-step explanation:

Im not sure which measure you're talking about, but I'll show you what I did here:

A triangle = 180 degrees.

4x + 8x + 4x =16x

-8 - 1 - 3 = -12

180 = 16x - 12 -Add 12 to both sides

192 = 16x -divide by 16 to get x by itself

12 = x

Angle A = 88 degrees (8 times 12 then subtract 8)

Angle B = 47 degrees (4 times 12 then subtract 1)

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1 year ago

Use the substitution method to solve the system of equations.

Murrr4er [49]

Answer:

D. (1/4, -2)

General Formulas and Concepts:

Pre-Algebra

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Brackets
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Left to Right

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Step-by-step explanation:

Step 1: Define Systems

y = -8x

4x - y = 3

Step 2: Solve for x

Substitution

Substitute in y: 4x - (-8x) = 3
Simplify: 4x + 8x = 3
Combine like terms: 12x = 3
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Step 3: Solve for y

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2 years ago

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densk [106]

Answer:

D. 14 Please mark as brainliest!

3 0

1 year ago

Read 2 more answers

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Ainat [17]

Answer:

The average rate of change is -3.

Step-by-step explanation:

Given : Function $f(x)=-3x+79$ over the interval 2 ≤ x ≤ 4.

To find : What is the average rate of change ?

Solution :

Function $f(x)=-3x+79$ over [2,4]

The rate of change is the slope of the line,

So, $\text{Rate of change}=\frac{f(4)-f(2)}{4-2}$

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$f(4)=-12+79$

$f(4)=67$

$f(2)=-3(2)+79$

$f(2)=-6+79$

$f(2)=73$

Substitute,

$\text{Rate of change}=\frac{67-73}{4-2}$

$\text{Rate of change}=\frac{-6}{2}$

$\text{Rate of change}=-3$

Therefore, The average rate of change is -3.

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IrinaK [193]

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