The difference of what number and 5 is 18?

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2

Find the amount of simple interest earned for depositing the given principle in an account if $2200 is invested at 5.5 % for 6 months

Amanufacturer knows that their items have a normally distributed lifespan, with a mean if 9.1 years, and standard deviation of 2.9 years. if you randomly purchase one item, what is the probability it will last longer than 10 years?