81 billion miles in scientific notation

In a 30-60-90 triangle, given the length of one side, the other two sides can easily be determined. A.) True B.) False

According to the school rules, Carol has to convince 60% of her classmates to vote for her in order to be elected class president. there are 32 students in her class. How many students must she convinced?

The original value of the car is $18,000 and it depreciates by 50% each year what is the value of the car after three years

How can 4.13E7 be expressed in standard notations

Solve using substitution y=-7x^2-9x+6 y = 1/2x+11 y=-x^2+x-5 y=x-5 y=3x^2-2x-1 y=x-1 y=2x^2-3x-1 y=x-3

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.