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3 years ago

- 7/10 + ? = -2 9/20Show your work.

Mathematics

1 answer:

alekssr [168]3 years ago

3 0

Answer:

?= -7/4 or -1 3/4

Step-by-step explanation:

-7/10+x=-2 9/20

-7/10+x=-49/20

+7/10 +7/10

x=-7/4

Algebra

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3 years ago

a toy rocket is launched from the top of a 48 foot hill. The rockets initial upward velocity is 32 feet per second and its heigh

sdas [7]

Answer:

t = 2.11 seconds

Step-by-step explanation:

A toy rocket is launched from the top of a 48 foot hill. The rockets initial upward velocity is 32 feet per second and its height h at any given second t is modeled by the equation:

$h=-16t^2+32t+48$

Let us assume that we need to find the time by it to reach the ground. It means h = 0

$-16t^2+32t+48=0$

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$t=\dfrac{-b\pm \sqrt{b^2-2ac} }{2a}\\\\t=\dfrac{-b+ \sqrt{b^2-2ac} }{2a},\dfrac{-b- \sqrt{b^2-2ac} }{2a}\\\\t=\dfrac{-32+ \sqrt{(32)^2-2\times (-16)(8)} }{2\times (-16)},\dfrac{-32-\sqrt{(32)^{2}-2\times(-16)(8)}}{2\times(-16)}\\\\t=-0.11\ s, 2.11\ s$

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3 years ago

- 7/10 + ? = -2 9/20Show your work.​

- 7/10 + ? = -2 9/20Show your work.