Express the following functions in the form (x + a)^2+ b where a and b can be negative numbers. 11. x^2 + 10x + 16
12. x^2 - 6x + 3
13. y = x^2 + 4x + 3
14. f(x) = x^2 + 6x - 2
15. f(x) = x^2 - 2x + 4
16. y = x^2-8x-3

PLEASE HELP

Which ahows the graph of the solution set of 6x+4y< 12

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You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?