Answer:
Bx3=27 there are 9 blue marbles
Step-by-step explanation:
Weight of copper in coin, divided by total weight of coin..
Multiplied by hundred in the numerator..
Answer:
21 = 21
Step-by-step explanation:
5x + 1 = 21
-1 -1
5x = 20
__ __
5 5
x = 4
5x + 1 = 21 First substitute x for 4
5(4) + 1 = 21 Then continue to solve the problem to get the proof
20 + 1 = 21
21 = 21
So firstly, factor out h on the left side: 
Next, divide both sides by h: 
Lastly, subtract both sides by b and your answer will be 