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3 years ago

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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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

Solution:

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"

There are 158 students registered for American History classes.

Therefore,

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

There are twice as many students registered in second period as first period

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

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

There are 10 less than three times as many students in third period as in first period

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

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

Substitute eqn 2 and eqn 3 in eqn 1

x + 2x + 3x - 10 = 158

6x = 168

Substitute x = 28 in eqn 2

y = 2(28)

Substitute x = 28 in eqn 3

z = 3(28) - 10

z = 84 - 10

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