Answer:
Yes it is, since a has to be less than or equal to 0, and -5 is indeed less than 0.
Step-by-step explanation:
A suitable calculator will tell you that percentage is about
48.
Answer:
a = 36.37 cm
c = 18.19 cm
Step-by-step explanation:
to find a, use tan
⇒ tan = 
⇒ tan 60 = 
tan of 60 is 1.732
⇒ 1.732 = 
multiply 21 on both sides
⇒ 1.732 x 21 =
x 21
⇒ 36.37 = a
to find c, use sine
⇒ sine = 
⇒ sine 60 = 
sine of 60 is 0.866
⇒ 0.866 = 
muliply 21 on both sides
⇒ 0.866 x 21 =
x 21
⇒ 18.19 = c
The formula for the area of a trapezoid is (B+B)H/2 it is going to be (10+12)*8/2=58
the area of the trapezoid is 58<span />