Help ASAP Select all the following that are quadratic equation.
( ) 5x^2+15x=0
( ) 6x-1=4x+7
( )x^2-4x=4x+7
( ) 2x-1=0
( ) 3x^2+5x-7=0
( ) x^3-2x^2+1=0

right answers only please do not waste my time cause 20 points are quite good

F(x)= 1/x-4, g(x)=4x+1/x a. use composition to prove whether or not the functions are inverses of each other. b. express the domain of the compositions using interval notation.

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.