H=-16t^+55t+50 where h is the height of the bird and t is the amount of time, in seconds, the bird has been in the air. How long will it take the bird to reach a height of 40

It will take the bird 3.61 seconds to reach a height of 40.

Step-by-step explanation:

You have:

H=-16t²+55t+50

where H is the height of the bird and t is the amount of time, in seconds, the bird has been in the air.

To know the time it will take for the bird to reach a height of 40, you must replace the height H with 40:

40=-16t²+55t+50

Then:

0= -16t²+55t+50-40

0=-16t²+55t+10

Being a quadratic function of the form 0 = A * x + B * x + C, to calculate the values ​​of x the expression can be applied:

In this case, being A = -16, B = 55 and C = 10 and replacing, the values ​​are obtained: t1 = 3.61 and t2 = -0.173. Since time cannot be negative, it will take the bird 3.61 seconds to reach a height of 40.

it's d.

step-by-step explanation:

because: -1(4x + 1y) +2 (1x-3y) distribute each number into the parenthesis.

then you would get: -4x - 1y + 2x -6y combine like terms

and get: 2x -7y

hope my answer has you if not then i'm sorry.

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10