Let's add the fractions first and then we can estimate the sum.
= 31/4 + 17/3 + 8/18
change to common denominators
= 279/36 + 204/36 + 16/36
add numerators only
= 499/36 or 13 31/36 or 13.86
ANSWER: (B) 13 is the best estimate of the answer. Normally we round up to 14 with a number like 13.86, but since that is not a choice, we can estimate 13 as the answer.
yes please check my most recent question
Area of one face=80/4=20
base length=10
area =1/2*10*h=20 where h is slant height.
h=20/5=4
so slant height h=4 cm
= 2x^3 +8x^2 +16x - x^2 -4x -8
= 2x^3 +7x^2 +12x -8
You would use the pythagorean theorem to solve this equation: a^2 + b^2 = c^2
12^2 + b^2 = 20^2
b^2 = 16
x = 16