Answer: 60
Step-by-step explanation: Okay, so 4 is approx 22.3 percent of 18, so 22.3 percent of 270 is approx 60. That's how I worked it out, please do tell if I am wrong.
So the board is divided into 5 pieces, and 2/5 of the board is left. The leftovers equal 4 originals. This is equal to 4 times 5.
equation:
2/5(5x)=20
2x=20
x=10
He started with 10 boards.
Hope this helps!
Answer:
60
Step-by-step explanation:
calculated it with scientific calculator
Distribute -4x^2 to the numbers in parentheses.
-4x^2(3x - 7)
-4x^2 * 3x - 4x^2 * (-7) = -12x^3 + 28x^2
