Without the tip it was $60. If you are being asked to add the tip it will be $69
Answer: 
Step-by-step explanation:
We can rewrite the left hand side as a perfect square, more specifically

So, taking the square root of both sides,

Step by Step:
(z^2 -2z)(10z-20)
z(z-2)+10(z-2)
(z+10)(z-2)
Hope this helps.
She burns 250 by herself and she burns 3 times as many with her sister.
Multiply the calories by herself by 3:
250 x 3 = 750
Now you need to multiply that by the number of hours.
The formula is a. t[c(h)] = 750h
Answer:I think it is 89
Step-by-step explanation: