Answer:
55 minutes
Step-by-step explanation:
Use a proportion.
x = the number of minutes.

Squared, so it is a parabola
leading coefieint (-4) is negative, so it opens down
it is concave down
What exactly is the problem? , there isn’t a photo or a description of what the problem is.
(5x7)÷70-8
First solve inside the parentheses.
35÷70-8
Order of operations so do division next
35÷70 = 0.5
0.5 - 8 = -7.5
I’m guessing you meant 4x^2 (x to the power of two or x squared) rather than 4x2 (4 multiplied by two, meaning 8).
4x^2 -(-3x-8)
= 4x^2 +3x +8
72-2 = 70