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tekilochka [14]
3 years ago
8

Alison bought 5 boxes of erasers,

Mathematics
2 answers:
matrenka [14]3 years ago
8 0

Answer:

1,060

Step-by-step explanation:

Each- Means multiplication.

You can add 212 - 5 times

212x5

Dima020 [189]3 years ago
5 0

Answer:

1060

Step-by-step explanation:

212 x 5 = 1060

212

<u>x5</u>

<u>5x200=1000</u>

<u>5x10=50</u>

<u>5x2=10</u>

<u>1000+50+10=1060</u>

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Answer:

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Four times the sum of a number and 15 is at least 120. Find all possible solutions for x
zloy xaker [14]
First translate the English phrase "Four times the sum of a number and 15 is at least 120" into a mathematical inequality.

"Four times..." means we're multiplying something by 4.

"... the sum of a number and 15..." means we're adding an unknown and 15 and then multiplying the result by 4.

"... is at least 120" means when we substitute the unknown for a value, in order for that value to be in the solution set, it can only be less than or equal to 120.

So, the resulting inequality is 4(x + 15) ≤ 120.

Simplify the inequality.

4(x + 15) ≤ 120
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4x ≤ 60 <-- Subtract both sides by 60
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Now that we have the inequality in a simplified form, we can easily see that in order to be in the solution set, the variable x can be no bigger than 15.

In interval notation it would look something like this:

[15, ∞)

In set builder notation it would look something like this:

{x | x ∈ R, x ≤ 15}

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