What is the x-coordinate of the center of the circle for the following circle equation?
x2 + y2 + 12x - 14 = 0

Which is the standard form for this number? (4 x 1 100 ) + (8 x 1 1,000 ) + ( 3 x 1 100,000 ) ? a) 0.004803 b) 0.04803 c) 0.0483 d) 0.483

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?