A store owner spends 7x + 13 dollars on two orders of boxes of light bulbs, including shipping. If the store owner spent a total of $90 on both orders, how much does a box of light bulbs cost in dollars?

Solve. -1.75 + 2.5 = ?

What is the answer 5i / (2+3i) ^2

Solve this equation: y-3x+15=10

What is the answer to 3n-5=7n+11

Slope=-1, y-intercept=0

What is the answer to the equation r+5/6=-3 1/6

Rearrange this equation to isolate c A=b (1/c-1/d)

Use the formula F=9/5C+32 to convert 24°c to degree F

Deluxe coffee is to be mixed with regular coffee to make at least 46 pounds of a blended coffee. The mixture must contain at least 11 pounds of deluxe coffee. Deluxe coffee costs $7 per pound and regular coffee $5 per pound.

Angie takes a loan of $1000 that has a simple interest rate of 3% annually. What is the amount of interest accrued after 2 years?