Answer:
7
Step-by-step explanation:
21 divided by 3 = 7
7 x 3 = 21
Answer:
78.54 millimeters
Step-by-step explanation:
A=πr^2
A= 3.14 times 5 millimeter squared
A=78.54
Answer:
a) 25/35
b) 30/42
Step-by-step explanation:
a)
Variable x = denominator if numerator is 25
5/7 = 25/x
5 × x = 7 × 25
5x = 175
x = 35
b)
Variable y = numerator if denominator is 42
5/7 = y/42
5 × 42 = 7 × y
210 = 7y
30 = y