pre algebra questions, math homework help

1.The length of a rectangle is 7cm greater than the width. The area is 450cm squared. Find the length and the width.

2. f=9/5c+32 Find C

3. Attached

4. Find the vertex of the parabola y=x^2+2

5. x^2+8x+16=49 use principle of square roots

6.4x^2+12x=7 completing the square

7. A lot is in the shape of a right triangle. The shorter leg measures 90m. The hypotenuse is 30m longer than the length of the longer leg. How long is the longer leg?

8. 3n^2+12n=-5 use quadratic formula

9. (x-5)^2=-36 solve for complex solutions

10. find y and x intercepts

y=x^2-6x-7