Answer:
First one
Step-by-step explanation:
Variable b is 7 more than variable c:
b = c + 7
Variable b is also 1 less than variable c:
b = c - 1
Answer: If there are 3000 students at Pikeville College, then there should be 150 teachers.
3000/20=150
So there are 150 teachers if there are 3000 students.
Answer:
The maximum height of the ball was 2.5 seconds after it was thrown.
Step-by-step explanation:
Answer:

Step-by-step explanation:
Set up the equation:
Since C(t) gives the number of cars purchased in the t-th year after 1998, then make the number of cars equal to 15 000 and solve for t - the year:
20t^2 = 15000
t^2 = 750
t = 
The year will be simply 1998 + 5 \sqrt{30}