A bag contains 4 blue coins and 7 red coins. A coin is removed at random and placed by three of the other color. What is the probability that the removed coin is blue?​

Part a : solve - vp + 40 < 65 for v . part b : solve 7w - 3r = 15 for r show your work!

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?