Answer:
The twins would be 13 years old.
Step-by-step explanation:
21+21+21+13+13 = 89
The range refers to the value of y for which x is define.
So let y=f(x),

Try making x the subject to obtain,

x is defined for all real values of y greater than
0.
Hence the correct answer is D.
Answer:
0
Step-by-step explanation:
Use two-point form to find the slope.
m=y2-y1/x2-x1
m=0-0/10-5
m=0/5
Answer:
I really can't see it
Step-by-step explanation: