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3 years ago

Help please!!! I need help!!!

Mathematics

1 answer:

Luden [163]3 years ago

5 0

16 is C because all you have to go is take some answers out its obviously under 90 degrees and it’s not that small to be 40 degrees

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Use the expression below to answer the question. 20 + 8y – 9y – 21 Which expression is equivalent? A. 2(10 + 4y – 7y – 19) B. 2(

Amanda [17]

Option D: $4(5+2y)-3(3y+7)$ is the correct answer.

Explanation:

The expression is $20+8 y-9 y-21$

Solving the expression, we have,

$-y-1$

Now, we need to find an expression equivalent to $20+8 y-9 y-21$

Option A: $2(10+4y-7y-19)$

Solving the expression, we have,

$\begin{aligned} 2(10+4 y-7 y-19) &=2(-9-3 y) \\ &=-18 y-6 y \end{aligned}$

From the result, the expression $2(10+4y-7y-19)$ is not equivalent to $20+8 y-9 y-21$

Option A is not the correct answer.

Option B: $2(10+4 y)-3(3 y-7)$

Solving the expression, we have,

$\begin{aligned} 2(10+4 y)-3(3 y-7) &=20+8 y-9 y+21 \\ &=-y+41 \end{aligned}$

From the result, the expression $2(10+4 y)-3(3 y-7)$ is not equivalent to $20+8 y-9 y-21$

Option B is not the correct answer.

Option C: $4(5+2y-5y-17)$

Solving the expression, we have,

$\begin{aligned} 4(5+2 y-5 y-17) &=20+8 y-20 y-68 \\ &=-12 y-48 \end{aligned}$

From the result, the expression $4(5+2y-5y-17)$ is not equivalent to $20+8 y-9 y-21$

Option C is not the correct answer.

Option D: $4(5+2 y)-3(3 y+7)$

Solving the expression, we have,

$\begin{aligned} 4(5+2 y)-3(3 y+7) &=20+8 y-9 y-21 \\ &=-y-1 \end{aligned}$

From the result, the expression $4(5+2 y)-3(3 y+7)$ is equivalent to $20+8 y-9 y-21$

Option D is not the correct answer.

8 0

3 years ago

Can someone please help me

zmey [24]

Answer:

Step-by-step explanation:

8 0

3 years ago

What is the solution to these equations y= 2x +1 and x +2y= 27

Llana [10]

Answer:

The first one is -1/2

the second one is x+2y-27=0

5 0

3 years ago

A student wrote and simplified an expression for the perimeter of the rectangle. (Using the picture provided.)

Nookie1986 [14]

Answer:

It’s 10n+12

They put the 2 n’s as an exponent

Step-by-step explanation:

3 0

3 years ago

A ladder is leaning against a vertical wall. The distance from the top of the ladder to the base of the wall is 17 feet. The dis

Gennadij [26K]

Answer:

18.4 feet

Step-by-step explanation:

-use the formula C^2 = A^2 + B^2 for a right triangle, which is made by the ladder and the wall.

-let the ladder be C, the wall be a, the base to the bottom be b.

-substitude into the equation, which will leave us with:

C^2 = 17^2 + 7^2

C^2 = 289 + 49

C^2 = 338

C = square root of 338, which is 18.4 feet!

3 0

3 years ago