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andrey2020 [161]
4 years ago
15

Please help me with this question

Mathematics
2 answers:
bezimeni [28]4 years ago
8 0
3x+21
3*x n 3*7=21 is 3x+21
taurus [48]4 years ago
6 0
3x+21 is a simplified version of this algebraic expression
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Answer:

58.8

Step-by-step explanation:

Because when he paid for it the first time he got 3.92$ per gallon so if you times 3.92 x 15 that's how much he is going to pay.

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2 years ago
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A monument in the shape of a right triangle sits on a rectangular pedestarl that is 7 meters high by 16 meters long. The longest
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Step-by-step explanation:

Hi, since the situation forms a right triangle and a rectangle, we have to apply the Pythagorean Theorem (for the triangle)

c^2 = a^2 + b^2  

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4 0
3 years ago
Six cell phones weigh 46.2 ounces. Fourteen cell phones weigh 107.8 ounces. What is the unit rate or constant of proportionality
iris [78.8K]

<u><em>Answer:</em></u>

<u><em>Well first we must see if they are proportional. </em></u>

<u><em> </em></u>

<u><em>46.2/6 = 10.7.8/14 </em></u>

<u><em>7.7 = 7.7 </em></u>

<u><em> </em></u>

<u><em>They are proportional. The rate of proportion is 7.7 ounces per cellphone. Hope this helps! </em></u>

<u><em /></u>

<u><em>Step-by-step explanation:</em></u>

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Step-by-step explanation:

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