How do you solve these?

-2x/3 - x/7 = 17

3/10 + 2x/5 = 1/2

3.5 hours to prepare. If she wants to be finished by 1:15, at what time should she start?

You want to buy a CD that cost $18.50. The sales-tax rate in your states is 4.5 percent. How much sales tax will you pay for this CD?

Suppose you deposit $100 in Account A with a simple interest rate of 3.4%, and $300 in Account B with a simple interest rate of 1.8%. One year later, you get a bank statement, that shows the interest for Account A is $3.

Stacy and Neil painted 280 ft^2 of their living room wall with 4/5 gallon of paint. How many square feet can they paint with 3 gallons of paint? Enter your answer in the box.

In Melissa's new clothing store, she charges $19.25 for each shirt she sells. What was Melissa's revenue if she sold 47 shirts last month?

Bruce wants to make sure that each tiger at the zoo has 1,000 square feet of space. He wants to write an equation to represent the relationship between the number of tigers, t, and the number of square feet of space, f.

What is 120 times 250

The circumference of the earth is approximately 24,901 miles. The circumference of the earth's moon is about 72.76% smaller than the earth's circumference. What is the approximate radius of the earth's moon? A. 1,079.55 miles B. 6,783.03 miles c.

What greater than. 375?

A triangle inscribed in a semicircle identified as a what triangle?