Given
d(t) = 0.8t ^2
t= 5 secs
d(5) = 0.8(5)^2 = 0.8 * 25 = 20
t= 10 secs
d(10) = 0.8(10)^2 = 0.8 * 100 = 80
20 m / 5 secs = 4 meters per sec
80 m / 10 sec = 8 meters per sec
4 mps + 8 mps = 12 mps
12 mps / 2 = 6 mps
6 mps is the average speed of the rock between 5 and 10 sec after being dropped
Answer: 14.1428571
Step-by-step explanation:
99/7=14.1428571
I don't understand what you mean by the highlighted one, but there's your answer for 99/7.
It said the sale earned OVER $25 from selling cookies at $3 dollars each so if we let r=revenue , p=price per cookie and c=number of cookies sold:
pc>r and since p=3 and r=25
3c>25 divide both sides by 3
c>25/3
Since cookies are quantized units, they must be integers so:
c>8 1/3
c≥9 or in interval notation
c=[9, +oo)
5(2y + 7) = 20
5(2y) + 5(7) = 20
10y + 35 = 20
<u> -35 -35</u>
<u>10y</u> = <u>-15</u>
10 10
y = -1 1/2
If Joe and Eugene are travelling in opposite directions, their total distance is 360 km.
Eugene's speed = 70 km/hour
Let Joe's speed be = x
They each travel for 3 hours, so time = 3 hours
Distance = speed * time
Hence, Joe's speed is 50 km per hour.
