50
Step-y-step explanation:
21
Step-by-step explanation:
5 + 2³ × 2 = 5 + 2⁴
=5 + 16
= 21
225x²+4=0
225x²=0-4
225x²=-4
x²=-4/225
x=±√-4/225
answer: i wpould go with c
step-by-step explanation: