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vampirchik [111]
2 years ago
11

Which is a simplified form of the expression 5c – 7(2c – 4)?

Mathematics
1 answer:
Sonja [21]2 years ago
5 0
1.
5c-7(2c-4)
5c-14c+28
-9c+ 28
2.
3(m+1) + 2m
3m+3+2m
5m+3
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kiyoko lives 7/8 of a mile from school. if she walks half the distance and runs the other half, both to and from school, how man
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Caterers made 272 cups of punch for a party. They will distribute the punch equally into 6 bowls. How many cups of punch will ea
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2 years ago
Which of the following functions are solutions of the differential equation y'' + y = 3 sin x? (select all that apply)
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C

Step-by-step explanation:

We must compute the derivatives and check if the equation is satisfied.

A. y'=(3\sin x)'=3\cos x. Differentiate again to get y''=(3\cos x)'=-3\sin x, then y''+y=-3\sin x+3\sin x=0\neq 3\sin x so this choice of y doesn't solve the equation.

B. y'=3\sin x+3x\cos x-5\cosx +5x\sin x=(5x+3)\sin x+(3x-5)\cos x and y''=5\sin x+(5x+3)\cos x+3\cos x-(3x-5)\sin x=(10-3x)\sin x+(5x+6)\cos x, then y''+y=10\sin x+6\cos x\neq 3\sin x so y is not a solution

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E. y'=\frac{3}{2}\sin x+\frac{3}{2}x\cos x hence y''=\frac{3}{2}\cos x+\frac{3}{2}\cos x-\frac{3}{2}x\sin x=3\cos x-\frac{3}{2}x\cos x. Then y''+y=3\cos x-\frac{3}{2}x\cos x-\frac{3}{2}x\cos x=3\cos x\neq 3\sin x then y is not a solution.

3 0
3 years ago
6.7<br> x 2.5<br> 2 x 6 =<br> 2 x 0.7 =<br> 1<br> 11<br> 0.5 x 6 =<br> 0.5 x 0.7 =
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