Aplumber charges $50 to come to a house and $20 an hour for work time.
if h represents the number of hours worked, which expression gives the total amount the plumber charges?
a.
50h + 20
b.
20h + 50
c.
20(h + 50)
d. + 50

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.

Which of the following circles have their centers in the third quadrant? check all that apply.

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?