Will give brainliest!

4. transform each polar equation to an equation in rectangular coordinates and identify its shape.
a. r=6
b. r=2cos theta

well, you know that r cos (theta) is the same as x, so:  

a) is simply x = 4 and that is a line.  

With b), multiply either side by r, so:  

r^2 = 6 r sin (theta), then we know that r sin (theta) is the same as y:  

r^2 = 6y, and we also know r^2 = x^2 + y^2, therefore:  

x^2 +y^2 = 6y, that is rectangular...  

So:  

a) x = 4  

b) x^2 +y^2 - 6y = 0  

Actually, for b you could always complete the square...  

x^2 + y^2 - 6y + 9 = 9  

x^2 + (y - 3)^2 = 9  

This would make a circle

6,250

step-by-step explanation:

to get the area, multiply 360 by 160.(57,600)

to find out how many bags of fertilizer it will take, first figure out how many square feet one bag can hold. divide 1000 by 8(125) to get the unit rate(how many square feet one pound of fertilizer can hold)and multiply it by 50(6250). if i haven't made a mistake, that is the answer.

48 / 6 = x

in this case, x will equal the amount of money in each card!

x therefore will be 8.

trent had $8 in each birthday card.