5a + 3 - 3a = - 7 how do I get the answer

A store pays $10 for a bracelet the markup is 115%

Cecile walked 5 miles in 2 hours. how many feet per second did she walk

What are the next two terms after 1/8,2/7,3/6,4/5, ... ? And inductive reasoning for it

The tetrahedron superyacht

The box plots below show the lifespan, in months, of laptop batteries manufactured by two companies: Based on the data, which company's batteries have the smallest median lifespan? Company A Company B Company C Company D

Mike and pat traveled 392 miles in 7 hours. If they travel at the same rate how long will it take them to travel 728 miles

Norma received one penny on first day of the month and each day after that she received triple number of pennies

Round-trip bus fare is $2. Justin rides the bus 5 days a weeks to work and 2 nights a week to school. He can buy a pass at school that allows 6 months of unlimited bus rides for $400.

Suppose that the number of inhabitants of country a is given by y=-7.24x+937.69 million, and the number of inhabitants of country b is given y=2.16x+834.29 million, where x is the number of years since 1960.

What is the sum of the geometric sequence 1, 3, 9, if there are 11 terms?