Explain why rationalizing the denominator does not change the value of the original expression

The sales tax is 5%. a laptop os $559 what is the total cost of the laptop including tax

Original price: $35 Percent of discount: Sale price: $31.50

Choose the scientific notation for 800. 8 x 103 8 x 102 8 x 101 8 x 100

Substitution y = 5x and 6x - 2y = - 4

Two pipes can fill a tank in 36 minutes if both are turned on. if only one is used, it would take 56 minutes longer for the smaller pipe to fill the tank than the larger pipe.

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.