26. Three quarters of the students running a 100-yard race finished with an average time of 16 seconds. The remaining 25% of students finished with an average time of 12 seconds. What was the
average time overall?
a. 13 seconds
b. 14 seconds
c. 15 seconds
D16 seconds
e. 17 seconds

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

- both graphs increase on their domain.

- the graphs of both functions have the same x-intercept.

- neither graph has a y-intercept.