3 years ago

9

Mathematics

1 answer:

timofeeve [1]3 years ago

6 0

Answer:the answer is B

Step-by-step explanation:

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X - (2x + 1) = 8 - (3x + 3)<br><br> Ayuda porfa

Marina86 [1]

Answer:

x = 3

Step-by-step explanation:

cambia los signos : x - 2x-1=8-3x-3

like terms : -x-1=5-3x

variable: -x+3x=5+1 --> 2x=6

dividir: x=3

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3 years ago

Sofia hits a softball straight up. the equation h= -16t^2 + 90t models the height h, in feet, of the ball after t seconds. How l

andrezito [222]

It is in the air 5.625 seconds.

Using the quadratic formula,

$t=\frac{-b\pm \sqrt{b^2-4ac}}{2a}
\\
\\=\frac{-90\pm \sqrt{90^2-4(-16)(0)}}{2(-16)}
\\
\\=\frac{-90\pm \sqrt{8100-0}}{-32}
\\
\\=\frac{-90\pm \sqrt{8100}}{-32}=\frac{-90\pm90}{-32}
\\
\\=\frac{-90+90}{-32}\text{ or }\frac{-90-90}{-32}=\frac{0}{32}\text{ or }\frac{-180}{-32}
\\
\\=0\text{ or }5.625$

0 is when the ball is first launched, 5.625 is when it hits the ground again.

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3 years ago

Lines AB and CD are parallel. Find the measures of the three angles in triangle ABF.

NeX [460]

Answer:

42 Degrees

Step-by-step explanation:

Angle ABF is parallel to the angle DCF

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kirill [66]

2(x + y) or 2y+x or 2x(x + y)

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Harman [31]

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