Step by step problem solving for 3.99 + 39.9 decimal problem

You are going to line up the decimal points to each other and add a zero to the end of the shortest decimal.

3.99+39.9=43.89

Step-by-step explanation:

You are going to take the 3.99 and add that to the 39.9 like normal but you are first going to line up the decimals.

At least 6

Step-by-step explanation:

I did guess and check for the formula. I first started with 5 golf balls

C(x)=5^2-18*5+141

C(x)=76 too high

Then I tried 6

C(x)=6^2-18*6+141

C(x) = 69

It would have to be 6 because you need a whole number of golf balls and 5 made the cost too high