A ball was thrown upward into the air. The height, in feet, of the ball above the ground t seconds after being thrown can be determined by the expression -16t^2 + 40t + 3. What is the meaning of the 3 in the expression?

A.
The ball was thrown from a height of 3 feet.

B.
The ball took 3 seconds to reach its maximum height.

C.
The ball took 3 seconds to reach the ground.

D.
The ball reached a maximum height of 3 feet.

The ball was thrown from a height of 3 feet

Step-by-step explanation:

If you put 0 for t, then you get 3 as a result of calculation.

It means the start point is 3 feet, in other words, the ball was thrown from 3 feet from the ground.

Correct choice is A.

1.3 million hoops i believe

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places