Step-by-step explanation:
Since y varies directly with x,
y = kx, where k is a real constant.
When x = 4, y = 32.
=> (32) = (4)k, k = 8.
Therefore when x = -2,
y = kx = (8)(-2) = -16.
Answer:
a^3+b^3=(a+b)(a^2-ab+b^2)
Step-by-step explanation:
x^3+27=(x+3)(x^2-3x+9)
.........................
4 - 20% is equal to 3.2 (You could've used a calculator.
Divide by 12375 and take the logarithm.
.. 500/12375 = 0.7749^(n -1)
.. log(4/99) = (n -1)*log(0.7749)
.. n = 1 +log(4/99)/log(0.7749)
.. n ≈ 13.583
