To find A' they used the rule of multiplication, which is:
the derivative of a product of two terms is the first term times the derivative of the second term plus the second term times the derivative of the first.
To find b' they just isolated b'
23.7 is 1/10 the value of 237
Th answer is the cost to rent for one day is the quotient of $10 and 3.
Multiply the first bracket by -4
Multiply the second bracket by 3
-4(2x - 5) = 3(x - 15)
-4(2x)-4(-5)= 3(x)+3(-15)
-8x+20= 3x-45
Move 3x to the other side. Sign changes from +3x to -3x.
-8x-3x+20= 3x-3x-45
-11x+20= -45
Move +20 to the other side. Sign changes from +20 to -20.
-11x+20-20= -45-20
-11x= -65
Divide by -11
-11/-11x= -65/-11
x= 65/11 or x= 5 10/11
Answer: x= 65/11 or x= 5 10/11