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What times what equals 460?
460 = 1 x 460 = 2 x 230 = 4 x 115 = 5 x 92 = 20 x 23
How do you set up the problem 4 times the square root of x less than 20?
Do it exactly as the question directs: Four times means you're multiplying SOMETHING by four, so go ahead and write a four down: 4 Times the square root of means you're multiplying 4 by the square root of SOMETHING, so go ahead and put that radical next to the four: (note that there is no radical sign on here, but x^(1/2) is the same thing as the square root of x, sooo): 4(SOMETHING^(1/2)) Now it tells us that SOMETHING is x less than 20, which means you're subtracting 20 by x, or: SOMETHING = 20-x. SO, putting 20-x instead of something into the expression leave us with: 4((20-x)^(1/2)) or, "four times radical twenty minus x." Hope that helps a little.
How do you factorise x6?
x times x times x times x times x times x = x6
10 less than 3 times a number is 20. What is the number?
The answer is 10. 3 x 10 = 30 30 - 10 = 20
What is the cube of 20?
20 cubed = 20 x 20 x 20 = 8000
