Write y=-4x^2+8x-1 in vertex form

In basketball, Katrina makes 6 out of every 9 free throws. Her coach claims that if she tries 15 free throws she should make 10 of them. I coach's claim correct?

Twice the sum of a number and 5

Joseph earns $10 per hour working as a janitor. How much money will he earn if he works 9 hours?

Use a linear equation to represent and solve the following situation a) Marco received a gift card for a local coffee shop. Every time he goes to the shop, he gets a medium coffee. After two visits, the gift card had $19.70.

On the first two quizzes of the year, Trista's grades were 80 and 85. Javier's grades were 85 and 90, and Yolanda's grades were 75 and 90. Write a 3 X 2 matrix to organize this information.

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.