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andrezito [222]
2 years ago
6

14 lessons costs $210. What would 72 lessons cost

Mathematics
2 answers:
Sidana [21]2 years ago
6 0

Answer:

If 14 is equal to 210 so

14---->210

So how much 72 costs

14----210

72-----??

So 72 multiple by 210 all divided by 14 which is original number of courses

(72*210)/14 = 1080

Oksi-84 [34.3K]2 years ago
4 0

Answer:

$1,080

Step-by-step explanation:

To solve, we can make a proportion

14 lessons are $210 and 72 lessons are $x

14/210=72/x

Cross multiply

14*x=210*72

14x=15120

To solve for x, we need to get x by itself. Since x is being multiplied by 14, divide both sides by 14.

14x/14=15120/14

x=1080

So, 72 lessons will cost $1,080

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Nadya [2.5K]

Answer:

-x^2 - 11x -30

Step-by-step explanation:

Solve using foiling. Ignore the -1 to begin with and just look at the part in parenthesis. Do x from the first parenthesis times the stuff in the second parenthesis.

ie: x(x) and x(6)

ie: x^2 + 6x

Then do the 5 times the things in the second parenthesis.

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Then add what you got from multiplying the first value to what you got from multiplying the second.

ie: x^2 + 11x + 30

This is a trinomial because it has three different variables. Now change all the signs to negative because of the -1 out front.

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2 years ago
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