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blondinia [14]
4 years ago
6

Whats the difference of the two expression? (3/7x+9)-(2/7x-3)

Mathematics
1 answer:
Aleksandr-060686 [28]4 years ago
4 0
\left(\frac{3}{7}x+9\right)-\left(\frac{2}{7}x-3\right)\\\\=\frac{3}{7}x+9-\frac{2}{7}x-(-3)\\\\=\frac{3}{7}x+9-\frac{2}{7}x+3\\\\=(\frac{3}{7}x-\frac{2}{7}x)+(9+3)\\\\=\frac{3-2}{7}x+12\\\\=\boxed{\frac{1}{7}x+12}
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Two sides of a triangle are 12 and 18 cm. Complete the inequality to show the possible lengths of the third side.
musickatia [10]

Let a = 12 and b = 18 be the two given sides

Let c be the unknown third side

Due a modified form of the triangle inequality theorem, we know that,

b-a < c < b+a

18-12 < c < 18+12

6 < c < 30 which is the final answer

This says c is between 6 and 30, but cannot equal either endpoint.

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3 years ago
At track practice peirce runs for 1 hour if it takes him 1/6 hour to run a mile how many miles does peirce run at practice
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Answer:

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Step-by-step explanation:

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schepotkina [342]

Answer:

C. 5 weeks.

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If we have two random variables X and Y, both normally distributed, the sum will have this properties:

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To calculate the expected weeks that the donation exceeds $120, first we can calculate the probability of S>120:

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The expected weeks can be calculated as the product of the number of weeks in the year (52) and this probability:

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Oksana_A [137]

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