Twice the sum of 10 and x equals 30

How many times dose 28 go into 6

There are 25 students in a class at the beginning of the school year and the average number of siblings for each student is three.

What is communiative property?

0 times - 6-6 squares divided by 4

1/2x + 1/2x + x - 15 + x - 25 + 100 = 540

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.