Answer:
The midpoint is
Step-by-step explanation:
we know that
The formula to calculate the midpoint between two points is equal to
we have
substitute
let side of cube=x cm
volume=x³ cm³
again side=(x-3) cm
volume=(x-3)³ cm³
x³-(x-3)³=1385
(a³-b³)=(a-b)(a²+ab+b²)
(x-x+3){x²+x(x-3)+(x-3)²}=1385
3(x^2+x²-3x+x²-6x+9)=1385
3(3x²-9x+9)=1385
9x²-27x+27=1385
9x²-27x+27-1385=0
9x²-27x-1358=0
x < 9
Subtract 2 from both sides so you can isolate the variable on the left.
7/10, 6/10, or 5/10
So, first, we change 4/5 into tenths. That equals 8/10. 3/10 and 8/10.
80 m²
The area (A) of a trapezoid is calculated as
A = h (a + b)
where h is the perpendicular height between bases and a, b are the bases
Here h = 8, a = 14 and b = 6, thus
A = × 8 × (14 + 6) = 4 × 20 = 80 m²