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suter [353]
3 years ago
12

4 × (1,351 - 381)

Mathematics
2 answers:
Dovator [93]3 years ago
6 0

The answer is C.

The expression is telling you to multiply the parenthesis times four. When you multply two numbers, a \times b, it means that you're considering a "copies" of b, or if you prefer, b repeated a times.

So, you have

2 \times (1.351 - 381) <- this is twice as much as the parenthesis

3 \times (1.351 - 381) <- this is three times as much as the parenthesis

4 \times (1.351 - 381) <- this is four times as much as the parenthesis

Natalka [10]3 years ago
6 0
The answer is C How I was able to help
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5 0
3 years ago
Read 2 more answers
There are 158 students registered for American History classes. There are twice as many students registered in second period as
Margarita [4]

There are 28 students in first period and 56 students in sceond period and 74 students in third period

<em><u>Solution:</u></em>

Let the number of students in first period be "x"

Let the number of students in second period be "y"

Let the number of students in third period be "z"

<em><u>There are 158 students registered for American History classes.</u></em>

Therefore,

x + y + z = 158 ---------- eqn 1

<em><u>There are twice as many students registered in second period as first period</u></em>

number of students in second period = twice of number of students in first period

y = 2x ------- eqn 2

<em><u>There are 10 less than three times as many students in third period as in first period</u></em>

number of students in third period = 3 times number of students in first period - 10

z = 3x - 10 ------ eqn 3

<em><u>Substitute eqn 2 and eqn 3 in eqn 1</u></em>

x + 2x + 3x - 10 = 158

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<em><u>Substitute x = 28 in eqn 2</u></em>

y = 2(28)

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<em><u>Substitute x = 28 in eqn 3</u></em>

z = 3(28) - 10

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<h3>z = 74</h3>

Thus there are 28 students in first period and 56 students in sceond period and 74 students in third period

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