7 - (-12) - 15, Simplify.

If you add a prime number to itself, is the sum composite or prime? Explain your reasoning

Express each of the following scales in the form 1: r. (a) 1 in : 4 yd (b) 32 yd : 1 mi (c) 4 cm : 500 m, (d) 0.2 cm : 0.04 km (remember 1 mile = 5280 ft)

Spyro ran 4 1/2 miles on Saturday and 5 3/4 miles on Sunday. How many total miles did he run? Write your answer as a simplified mixed number.

Solve the system of equations. {y=x-6 {3x+2y=8 Use the substitution method. (14, 8) (4, - 2) (0, - 6) (3, - 3)

What is equivalent to - 4 + (4+5)

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.