The first one is 15 mornings
Step-by-step explanation:
f(3) = 48
f(3)-f(4) = 3*3^2
f(4) = 21
f(4)-f(5) = 3*4^2
f(5) = -27
She counts 8 markers because 4/5 equals 8/10 and she counts the mile markers every 1/10 of a mile.
4 - 2/3x = -7 would be the equation to represent this.
Assuming your "x" is a multiplication symbol, you can divide the equation by 6 to get
10 + s = 17
Subtract 10 from both sides of the equation to find the value of s.
s = 7