Evaluate 1/4c + 3d when c=6 and d=7

So, (1/4)x6 + 3x7 = 3/2 + 21/1 = 3/2 + 42/2 = 45/2;

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2

if you was gonna solve for a, a is a   < -12