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3 years ago

Which expression represents the phrase "three times the sum of a number and 4"?

Mathematics

2 answers:

Ivan3 years ago

7 0

Answer:

The answer is: 3(x+4)

Step-by-step explanation:

Oof

Darya [45]3 years ago

4 0

Answer:

The correct option is 2.

Step-by-step explanation:

The given statement is "three times the sum of a number and 4".

We need write the mathematical expression for the given statement.

Let the unknown number be x.

The sign " + " is used for addition and sum.

The sign " × " is used for multiplication, times and product.

Sum of a number and 4 = $(x+4)$

Three times the sum of a number and 4 = $3\times (x+4)=3(x+4)$

The required expression is 3(x+4). Therefore, the correct option is 2.

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If f(x) = 2x^2 + 2, find f(5)

zlopas [31]

Well, following the order of PEMDAS, I got choice B. 52

For instance, when you plug in 5 for x, you get F(5)=2(5)^2+2.

Moreover, following PEMDAS, you're supposed to solve what's inside the parenthesis, but since there is no operation going on inside the parenthesis, then you simple move on to the exponent.

In this case, you square the number 5, which gives you F(5)=2(25)+2

After that, you Multiply (letter M in PEMDAS). This results in F(5)=50+2.

Finally, you add them, which results in F=52.

By the way, I noticed a mistake in your work. When multiplying 2 by 5, the answer is 10, not 20.

Anyway, hope this helped! :-)

8 0

3 years ago

If f ( x ) = 3x² - 5x + 7 , Show that f ( -1 ) = 3 f ( 1 ) . Tysm :')

Lelechka [254]

Solution :

3x² - 5x + 7

put x = -1

3(-1)² - 5(-1) + 7

3(1) + 5 + 7

3 + 12

Now, put x = 1

3(1)² - 5(1) + 7

3(1) - 5 + 7

3 + 2

here :

f(-1) = 15

f(-1) = 3(5)

f(-1) = 3 f(1)

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2 years ago

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yawa3891 [41]

Answer:

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Step-by-step explanation:

I graphed the points on the graph below. Then I found the slope of the line.

If this answer is correct, please make me Brainliest!

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