The area of the pentagon is 140
8(8v-7)=12-4v
multiply the bracket by 8
(8)(8v)=64v
(8)(-7)=-56
64v-56=12-4v
move -4v to the other side
sign changes from -4v to +4v
64v+4v-56=12+4v
68v-56=12+4v-4v
68v-56=12
move -56 to the other side
sign changes from -56 to +56
68v-56+56=12+56
68v=12+56
68v=68
divide both sides by 68 to get v by itself
68v/68=68/68
cross out 68 and 68, divide by 68
then becomes 1*1*v=v
v=68/68
Divide the fraction by 68
68/68=1, 68/68=1
1*1=1
Answer:
v=1
2x+4x-4=80
6x-4=80
6x=84
84/6=14
Angle c = 4 x 14= 56 - 4 = 52
Hope this helps.
Answer:
Step-by-step explanation:
take 43 degree as reference angle
using tan rule
tan 43 = opposite / adjacent
0.93 = x / 56
x = 56/0.93
x = 60.21
x = 60.2
