The first number is 15. The 2nd number is 30 cuz it’s double the first. The third number is 18 less than 30 so it is 12. They all add up to 57. Third # = 12
Not many steps can be included
Since 42 is in parenthesis you multiply it by 7
Giving you
294
Dude, this is simple addition. 28.35 + 17.26 = 45.61
He now has $45.61
Solution
if the number _C__ is a root of a polynomial, then x-c is a factor.
Whenever we have a polynomial
Example

Hello! So in order to solve this problem, it's best to start off making an equation. $18 + $.15x = $29.25
In this equation x represents the number of minutes she used. So now, we just have to solve for x.
First subtract $18 from both sides. Your new equation will be $.15x = $11.25. Then divide both sides by $.15 to get x by itself. $11.25/$.15 = 75.
So we can conclude that Bella spoke on the phone for 75 minutes this last month. Hope this helps!