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Black_prince [1.1K]

3 years ago

9

Need math help please!!

1 answer:

Eva8 [605]3 years ago

8 0

Answer:

8

Step-by-step explanation:

The fact that DE is perpendicular to AC means triangles AED and CED are congruent and side AD is equal in length to side CD.

5x -20 = 2x +4

3x = 24 . . . . . . . add 20-2x

x = 8 . . . . . . . . . .divide by 3

The value of x is 8.

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How can you use doubles when multiplying with 4 to find 4x8

pshichka [43]

4 = 2 * 2

Multiplying by 2 is the same a doubling.
Since 4 is 2 * 2, to multiply a number by 4, double the number twice.

Example:
What is 4 * 100?
Double 100 to get 200.
Double 200 to get 400.
Therefore, 4 * 100 = 400.
By doubling twice, we do the same as multiplying by 4.

4 0

3 years ago

Alexei wants to hang a mirror in his boat and put a frame around it. The mirror and frame must have an area of 19.25 square feet

zhuklara [117]

Let

x---------> the thickness of the frame in feet

At-------> Area of the mirror and the frame in square feet

we know that

$At=19.25ft^{2}$ ------> equation $1$

$At=(3+2x)*(5+2x)\\ At=3*5+3*2x+5*2x+2x*2x\\ At=15+6x+10x+4x^{2} \\ At=4x^{2} +16x+15$ --------> equation $2$

equate equation $1$ and equation $2$

$19.25=4x^{2} +16x+15\\ 4x^{2} +16x+15-19.25=0\\ 4x^{2} +16x-4.25=0$

therefore

the answer is the option

$C. 4x2 + 16x - 4.25 = 0$

5 0

3 years ago

Read 2 more answers

On a coordinate plane, a dashed straight line has a negative slope and goes through (0, 2) and (4, 0). Everything below and to t

yanalaym [24]

Answer:

Option C.

Step-by-step explanation:

A dashed straight line has a negative slope and goes through (0, 2) and (4, 0).

The given inequality is

$y$

We need find the point which is a solution to the given linear inequality.

Check the given inequality for point (2, 3).

$3$

$3$

This statement is false. Option 1 is incorrect.

Check the given inequality for point (2, 1).

$1$

$1$

This statement is false. Option 2 is incorrect.

Check the given inequality for point (3, -2).

$-2$

$-2$

This statement is false. Option 3 is correct.

Check the given inequality for point (-1,3).

$3$

$3$

This statement is false. Option 4 is incorrect.

Therefore, the correct option is C.

4 0

2 years ago

How long will it take you to drive 135 miles at a speed of 45 miles per hour?

alexandr402 [8]

Answer:

3 hours

Step-by-step explanation:

135/45=3

4 0

3 years ago

Read 2 more answers

What is the answer if you substitute 74 for y 74=x-1

klio [65]

Answer:

x=75

Step-by-step explanation:

74 = x-1

+1 +1

75=x

8 0

2 years ago