Answer:
Student-A:
mile/min
Student-B:
mile/min
Student-C:
mile/min
Step-by-step explanation:
Student-A:
she can run 2/3 mile in six minutes
so,
total distance is miles
total time =6 min
we can use formula
speed=(total distance)/(total time)
mile/min
Student-B:
she can run 1/2 mile in 4 minutes
so,
total distance is miles
total time =4 min
we can use formula
speed=(total distance)/(total time)
mile/min
Student-C:
she can run 4/5 mile in 8 minutes
so,
total distance is miles
total time =8 min
we can use formula
speed=(total distance)/(total time)
mile/min
7/10... 14/20, 28/40
12/11... 6/6.5, 24/22
3/2... 6/4, 12/8
11/4... 22/8, 33/16
5/12... 10/24, 20/48
Option B: 1.6 s.
Although the equation is not included, you can obtain it by physical considerations
H(t) = -16.t^2 + 52t + 16
The maximum point is at the vertex and the vertex is in the middle of the roots.
The roots are when H(t) = 0,
So you have to solve 0 =-16t^2 + 52t + 16
Use the quadratic formula and you will find t = 3.53 and t =-0.28
Then the vertex is at the middle point = (3.53 -.028)/2 =1.63 s and the answer is option B: 1.6 s.
4+.95=4.95
4.95*3= 14.85
The student paid $14.85 for the three cans.