Hello from MrBillDoesMath!
Answer:
4/5
Discussion:
80% = => percent means "per 100"
80/100= => 80 = 8 * 10; 100 = 10 * 10
(8*10)/(10*10) = => cancel 10 from numerator and denominator
8/10 = => divide numerator and denominator by 2
4/5
Thank you,
MrB
4z-20+2=4z-18
4z-18=4z-18
Their answer is the same no answer for this .. or maybe you forgot to wrote an other thing... I hope that I could help you!! :)