A boy is 10 years older than his brother. In 4 years he will be twice as old as his brother. Find the present age and write an equation to solve for it.

Problem solving exercise 3d+d-7=25/4

If the percent error is 10% and the actual amount is 350, what is the range of possible values?

Let f (x) = sqrt x-5. Find f^-1

Solving for x and y in a linear equation (x, y) -11x-10y=17 5x-7y=50

Add a hotdog stand they serve regular and foot-long hotdogs at a ratio of 5 to 3. Based on this ratio, how many foot long hotdogs will be served if there are a total of 120 dogs served.

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.