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60
It's easy to find 10% Just move the decimal point one place to the left 10%=15. Now multiply that 10% by 4 to get 40% 15%x4 = 60% 40 percent of 150.00 = 60
x4 + 7x2 - 60 = x4 + 12x2 - 5x2 - 60 = x2(x2 + 12) - 5(x2 +12) = (x2 - 5)(x2 +12)
You will need 1.23 cubic yards.
Concrete weighs about 150#'s per cubic foot. Given that your measurements are 2'x2'x4', the block contains about 16 cubic feet. 16 cubic feet of concrete at 150#'s is about 2400#'s per block.