Simplify this and show your work :

Dan says 3/5 is the same as 3.5 is he correct?

Valerie is a big fan of country-western music and buys one CD every week. With tax, each CD costs her about $9. She also attends two concerts each year. the admission charge for each concert amounting to $40.

A new uniform costs $49.99. If it is on sale for 15% off, what is the cost before tax?

Darryl is three inches taller than Reggie. Their heights, combined is 138 inches. How tall is Reggie?

What is the function f (x) = 3 (x^2-8x) + 10 written in vertex form

What is the percent change from 70 to 56

Which rational number is equivalent to 3.27 repeating? A. 327/990 B. 27/99 C. 47/11 D. 3 27/10 E. 3 27/100

Which of the following is a regular polygon?

The sloping side of a cone is 10cm and the height is 8cm. find the radius of the base

Two companies make batteries for cell phone manufacturers. One company claims a mean life span of 2.5 years, while the other company claims a mean life span of 3 years (assuming average use of minutes/month for the cell phone).