1)
Solving from system of equations:
x- amount of 1 cent stamps
y- amount of 33 cent stamps

2)
x- amount of 20 cent stamops
y-amount of 34 cent stamps
From system of equations:
21 hours
73.50 x 3.50 = 21 hours
Answer:
D. 14
Step-by-step explanation:
a^2+b^2=square of c
a^2+x^2=50
30%.
6 nickels equal 30 pennies, and 100 pennies make up a dollar.
30/100 = 30%.