Solve for y by simplifying both sides of the equation, then isolating the variable.
y = 7x/2 - 3
Let width of the rectangular plot be x meters
then total of widths = 2x
and the length would be (550 - 2x) meters.
so the area = x(550 - 2x) = 550x - 2x^2
to find the maximum are find the derivative and equate to zero:-
f'(x) = 550 - 4x = 0
x = 550/4 = 137.5 meters = width
length = 550 - 2(137.5) = 275
Maximum area is when width = 137.5m and length = 275m
She will need 8 more barbies, to reach a total of 12.
Hope this helps!
V = 20 cm ^3
multiply 6 cm by 5 cm by 2/3 cm and your answer is 20cm^3