Cody has 22 rare coins. Each year Cody plans to add 15 coins to his collection. How many years will it take Cody to collect 577 coins?

Answer 1

To collect 577 coins, Cody needs to add 577 - 22 = <<577-22=555>>555 more coins to his collection.
Since Cody adds 15 coins to his collection each year, it will take him 555 / 15 = <<555/15=37>>37 years to collect 555 more coins. Answer: \boxed{37}.

Answer 2

Tom is giving the equation 10x+15=20 to solve. He says the solution is 1/2. Which reason justifies his solution?

Answer 3

If Tom is claiming that the solution to the equation 10x + 15 = 20 is 1/2, we can check his answer by substituting x = 1/2 back into the equation and verifying if the equation holds true.

When we substitute x = 1/2 into the equation, we get:

10(1/2) + 15 = 20
5 + 15 = 20
20 = 20

The equation holds true, so x = 1/2 is indeed a valid solution to the equation. Therefore, Tom's solution is justified.

Answer 4

Dr. Burrows is measuring the weight of a substance for a science experiment. He added a mystery substance (M) to his experiment. Dr. Burrows used the equation 13.93 + m = 18.0 to find out how much he added. How much of the mystery substance (m) did he add to his experiment?

Answer 5

To find out how much of the mystery substance (m) Dr. Burrows added to his experiment, we can solve the equation 13.93 + m = 18.0 for m.

First, subtract 13.93 from both sides of the equation:

13.93 + m - 13.93 = 18.0 - 13.93

This simplifies to:

m = 4.07

Therefore, Dr. Burrows added 4.07 units of the mystery substance (m) to his experiment.

Answer 6

five times what number plus 10 equals 20

Answer 7

To solve the equation "five times what number plus 10 equals 20," we'll represent the unknown number as "x" and set up the equation:

5x + 10 = 20

To solve for x, we'll subtract 10 from both sides of the equation:

5x + 10 - 10 = 20 - 10
5x = 10

Next, we'll divide both sides of the equation by 5 to isolate x:

5x / 5 = 10 / 5
x = 2

Therefore, the number is 2.