1- what is the slope of the graph of Y=12x-19?

2-given f(x)=7(9-x) , which is the value of f(-3)?

On a piece of paper graph f(x)=5•(0.4)^x

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items