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2 years ago

If x = 4, what is the value of 2x2 - 7?

Mathematics

2 answers:

Serhud [2]2 years ago

8 0

A because it doesn’t make sense if you say 2x2 -7 so it is probably 2x by the power of 2

Fudgin [204]2 years ago

5 0

Answer:

A) 25

Step-by-step explanation:

I am assuming that you mean: 2x² - 7.

$2(4)^2 - 7\\\rule{150}{0.5}\\\rightarrow 2 *4^2 - 7\\\\\rightarrow 2 * 16 - 7\\\\\rightarrow 32 -7\\\\\rightarrow \boxed{25}$

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2. A book with a green sticker costs $2 less than half the price of a

Damm [24]

For this case we can propose an equation that will allow us to find the price of one of the books knowing the price of the other.

x: Let the variable that represents the price of the book with a green sticker

y: Let the variable that represents the price of the book with a yellow sticker

According to the statement we have:

$x = \frac {y} {2} -2\\$

$y=2(x+2)$

Finally, we can substitute the price of one of the books and clear the value of the other as the case may be.

Answer:

$x = \frac {y} {2} -2$

8 0

3 years ago

Which of the following lists of fractions are in order from least to greatest? Select TWO that apply.

lora16 [44]

Answer:

i think its a 1/4 then 2/3 and 3/10

4 0

3 years ago

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In an animal shelter, the ratio of dogs to cats is 5 to.There are 25 dogs. Write and solve a proportion to find the number c of

pishuonlain [190]

Answer:

5 cats

Step-by-step explanation:

d/c = 5/1

d = 25 Substitute in the proportion

25/c = 5/1 Multiply both sides by c

25 = 5c/1

25 = 5c Divide each side by 5

c = 5

There are five cats.

4 0

3 years ago

Eight students were asked how many books they read last summer. Their answers are listed below.

likoan [24]

Mode is 7 and the range is 6

6 0

4 years ago

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Can someone please tell me the aswer

Artist 52 [7]

Answer:

2x-2+3x

Step-by-step explanation:

2x-2+3x

combine like terms (2x + 3x = 5x)

So 2x-2+3x = 5x-2

3 0

3 years ago