Four tangent circles centered on the x-axis are shown below. the radius of circle a is twice the radius of circle o. the radius of circle b is three times the radius of circle o. the radius of circle c is four times the radius of circle o. all circles have integer radii. the point (63, 16) lies on circle c. what is the standard equation of circle a? a detailed explanation would be preferred : )

What is the definition of exponential decay?

An appliance store sells lamps at $95.00 for two. a department store sells similar lamps at 5 for $250.00. which store sells at a better rate

Michelle and julie work at a catering company. they need to bake 264 cookies for a birthday party that starts in a little over an hour and a half. each tube of cookie dough claims to make 36 cookies, but michelle eats about 1/5 of every tube and julie makes cookies that are 1.5 times as large as the recommended cookie size.it takes about 8 minutes to bake a container of cookies, but since julie's cookies are larger, they take 12 minutes to bake. a. how many tubes should each girl plan to bake? how long does each girl use the oven? b. explain your solution process what did you make? c. what assumptions did you make?