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3 years ago

Evaluate −f(a) f(x)=−5x²+2x−1

1 answer:

5 0

$\bf f(x)=-5x^2+2x-1\implies f(a)=-5(a)^2+2(a)-1
\\\\\\
f(a)=-5a^2+2a-1
\\\\\\
-f(a)\implies -~[-5a^2+2a-1]\implies 5a^2-2a+1$

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3 years ago

A small tree is 80 cm tall.

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3 years ago

NASA launches a rocket at t = 0 seconds. Its height, in meters above sea-level, as a function of time is given by h ( t ) = − 4.

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Answer:

A.) 24.08 seconds

B.) 825.42 metres

Step-by-step explanation:

function of time is given as

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The time t the rocket will reach its maximum height will be at the symmetry of the parabola.

t = -b/2a

Substitute b and a into the formula

t = -118/-2(4.9)

t = 118/9.8

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Since NASA launches the rocket at t = 0 seconds, the time it will splash down into the ocean will be 2t.

2t = 2 × 12.041 = 24.08 seconds

Therefore, the rocket splashes down after 24.08 seconds.

B.) At maximum height, time t = 12.041s

Substitute t for 12.041 in the function

h ( t ) = − 4.9 t 2 + 118 t + 115

h(t) = -4.9(12.041)^2 + 118(12.041) + 115

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3 years ago

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ElenaW [278]

Answer:

Step-by-step explanation:

The answer would be the first option because it’s starting at 4.5, and if you subtracted 2.5, you would get the answer of 2, and that’s what the first option shows. Hope this helps!

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2 years ago

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Answer:

The total surface area of triangular pyramid is 172 cm squared

Step-by-step explanation:

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Number of faces 4.
Number of vertices of a triangular pyramid is 6.
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