Select all equations that have infinitely many solutions.

a)4+4x-9=8x+4(x-9)

b)9(3x-5)+7=-3(7-8x)

c)8x+4=2(4x+2)

d)4(x-3)+7=x-(5-3x)

Which of the following equations is of the parabola whose vertex is at (4, 3), axis of symmetry parallel to the y-axis and focus at (4, -3)? a.) y+3=1/24 (x+4)^2 b.)y-3=-1/24 (x-4)^2 c.)x-4=-1/24 (y-3)^2

Find an equation for the linear function which has slope -10 and x-intercept -7

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?