Answer:
The pebble will hit the ground 8.29 second after it is thrown.
Step-by-step explanation:
Given that,
The height of the pebble after t seconds is given by the equation
h= -16t²+24 t+900.
When the pebble hit the ground, the height of the pebble will be zero.
So putting h=0 in the given equation.
0 = -16t²+24 t+900
⇒-4(4t²-6t-225)=0
⇒4t²-6t-225=0
Applying quadratic formula 
, here a=4, b= -6 and c= -225.
⇒ t = 8.29, -6.79
Since time can not negative.
∴t=8.29 seconds.
The pebble will hit the ground 8.29 second after it is thrown.
Answer: A. contains a number and a unit
Step-by-step explanation:
Quantitative observations measure the quantity, or the amount, of a certain thing. Therefore they must always use a number value to measure the amounts, and a unit to signify what the amount is for.
Answer:
x = 14 is your answer
Step-by-step explanation:
76 = 7x-22, so to figure it out, you first move -22 to the other side and get
76+22 = 7x.
add them together and you get 98 = 7x
7x would be your equation, so divide 98 by 7 and you get your solution
x = 14 is your answer
Answer:
A ; C ; D
Step-by-step explanation:
Volume of a rectangular prism:
V = l x w x h
1) 5 x 4 x 3 = 60 (ok)
2) 25 x 20 x 15. The result is > 60
3) 5 x 2 x 6 = 60 (ok)
4) 4 x 1 x 15 = 60 (ok)
5) 5 x 8 x 2 = 80
Answer:
The answer is 1.
Step-by-step explanation:
One is the divisor of every integer. Or, every whole number is the product of 1 and itself
