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olga2289 [7]
2 years ago
15

Seven more than twice a number is equal to 21. Find all the numbers that make this sentence is true.

Mathematics
1 answer:
julsineya [31]2 years ago
6 0

x = a number

7 + 2x = 21

Subtract 7 from both sides

2x = 14

Divide both sides by 2

x = 7

7 is the only number that makes this sentence true.

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2 years ago
What are two numbers that when multiplied equal -30 and when added together equal 1?
UkoKoshka [18]

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5 0
3 years ago
Read 2 more answers
H(x)=1/8x^3-x^2<br><br> Over which interval does h have a positive average rate of change?
lara31 [8.8K]

Answer:

(-\infty,0)\cup(\frac{16}{3},\infty)\\That \ is x\frac{16}{3}

Step-by-step explanation:

h(x)=\frac{1}{8}x^{3} -x^{2} \\\\Differentiate \ h(x) \ with \  respect \ to \ x\\h'(x)=\frac{3}{8}x^{2} -2x

For positive rate of change h'(x)>0

\frac{3}{8} x^{2} -2x>0\\x(\frac{3}{8}x-2)>0\\\\ When \ x0 \ (multiplication \ of \ two \ positives \ is \ positive)\\\\h'(x)>0 \ when \ x\frac{16}{3} \\\\

6 0
3 years ago
I need to know what this answer is
lawyer [7]
3.4x3=10.2...
hope this helps!!
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3 years ago
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