how do you do these?
find the sum of the solutions (prefably without a calculator):
log2 (9-2^x)=3-x
(the 2 is supposed to be a lower subscript)
a box contains 10 tennis balls numbered 1,2,3...9,10. the tennis coach randomly selects 5 balls without replacement. what's the probability that the smallest ball drawn is a 4?
how many pairs of integers(x,y) will solve the equation 6x^2-3xy-13x+5y=-11?
thank you!