Answer:
50
Step-by-step explanation:
40 squared is 1600
30 squared is 900
1600+900=2500
=50
7/8, One should first make all the fractions have the same denominator so 3/8 and 1/2=4/8 so then add 3/8+4/8=7/8
400x1.036 then that multiplied by 1.036 and every answer just multiply by that