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Rzqust [24]
3 years ago
6

Help please! And thank u

Mathematics
2 answers:
Radda [10]3 years ago
6 0
A/7 + a/3 = 10
a = 21
Zigmanuir [339]3 years ago
6 0

Answer:

\frac{a}{7}  +  \frac{a}{3}  = 10 \\  \frac{(3a + 7a)}{21}  = 10 \\  \frac{10a}{21}  = 10 \\ a =  \frac{(10 \times 21)}{10}  \\  \boxed{a = 21}

<h3><u>a=21</u> is the right answer.</h3>
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Lady_Fox [76]

Answer:

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Step-by-step explanation:

People use water to​ cook, clean, and drink every day. An estimate of 33.9​% of the water used each day is for cooking. If a family uses 67.8 gallons of water a day for cooking​, how many gallons do they use every​ day?

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5 0
3 years ago
I need help please, 20 points
valkas [14]

Answer:

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Step-by-step explanation:

7 0
3 years ago
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snow_lady [41]

Answer:

5/8

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elena-s [515]
Hi there!

Using the formula - n-2*180 -, we know that the interior angles of a pentagon add up to 540. We can use the values we're given and add them together and set them all equal to 540, then solve.

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8 0
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Answer:

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Step-by-step explanation:

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