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3 years ago

1

Mathematics

1 answer:

galina1969 [7]3 years ago

7 0

Answer:

X .

-1 | 2

-11-1

-11-4

0 3

2 1-1

-13

-4-1

--3 0

-1 2

-1 1

0 3

2-5

0 0

A. III

B.IV

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

we have

$h=-16t^2+55t+4$

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The vertex represent a maximum

where

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The formula to solve a quadratic equation of the form

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$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$-16t^2+55t-36=0$

$a=-16\\b=55\\c=-36$

substitute in the formula

$x=\frac{-55\pm\sqrt{55^{2}-4(-16)(-36)}} {2(-16)}$

$x=\frac{-55\pm\sqrt{721}} {-32}$

$x=\frac{-55+\sqrt{721}} {-32}=0.88\ sec$

$x=\frac{-55-\sqrt{721}} {-32}=2.56\ sec$

therefore

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Step-by-step explanation:

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