Answer:
1 hour each 30 minutes so the answer is 30 minutes
3x -7 = 5x + 19
-7 = 2x + 19
-26 = 2x
x= -13
From reading the answers shown, it is NOT either of the answers in the middle. I believe that the first answer is the correct one. (It's not expected for a student to get around a 77 if they only spend 3.75 hours studying. anyone can get any percentage for any amount they spend studying)
Answer:
https://web2.0calc.com/questions/math-problems_7
Answer:
square root of 96 or 9.79
Step-by-step explanation:
a2+b2=c2
2square+b2=10square
4+b2=100
(4-4)+b2=(100-4)
b2=square root96 or 9.79