answer is b
multiply the first equation by -3 would give you
-12x + 18y = -6
to eliminate x on the second equation, you would need 12x to cancel the -12x on the first equation
what number times 3x woud give you 12x? the answer would be 4.
lets multiply equation 2 by 4 to see what happens
12x + 20y = 44
so 12x will cancel -12x on the first equation
24.13274 cm^3 rounded is 25.13
so 25.13 centimeters cubed is your answer
the general formula for compound interest is
a = p(1 + r/n)^nt where p = initial amount, r = yearly rate ( as a fraction), t = number of years and n = number of times in the year that interest is added.
so for the given data:
amount after 1 year = 500 ( 1 + 0.05/365)^365