Factor 16x^2+16x+4

which one is it?
a. (16x+16)(x+1)
b. already in factored form
c. (4x+2)(4x-2)
d. (4x+2)(4x+2)

An air conditioning system can circulate 350 cubic feet of air per minute. how many cubic yards of air can it circulate per minute?

What is the y-intercept of the line given by the equation

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?