Rewrite the following equation in standard form.
y = 2x + 1

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Which of the following parabolas opens down?

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.