The toy rocket hits the ground when h(t) = 0.
So, h(t) = 0 = -9t^2 + 81.

Solving the equation,
-9t^2 = -81
Dividing by -9
t^2 = 9
Taking the square root.
t = 3

The answer is 3 seconds.

7 0

4 years ago

What will be the cost of the paving if cement costs $26.50 per square metre?

WITCHER [35]

Answer: $2203.74

Step-by-step explanation:

4 0

3 years ago

Sharon wants to buy a shirt that costs $55. The sales tax is 5%. How much is the sales tax? What is her total cost for the shirt

Semmy [17]

easy

5% is .05 two decimals to the left

55 x .05 = 2.75

$2.75 is your sales tax

55+2.75=$57.75

8 0

3 years ago

Can someone please help , I have no idea at all :((

frez [133]

D=62*
triangles=180*
use the equation 90+28+d=180

8 0

3 years ago