DIFFERENTIATION
6+f(28+b(4)=6+112f+4bf
b=6+112f/-4f
b=1*6^0+1*112f^0/1*-4f^0
b=1+1/1
b=2
Because 1/4 is a fractional number, it is also a ratio which means it is Rational. :)
If 7x+3=24, that means x would be 3 so if you take 5-4x then that would be -7.
Let the cost of a shirt be s.
Three shirts = 3s.
3s + 15 ≤ 80 (Answer F)
