<u>Answer:</u>
a = 8.1
<u>Step-by-step explanation:</u>
Use the cosine rule:

Substituting the values:

⇒ 
⇒ 
the awser is (-2)(8 + 6) + (-3)
Answer: 5%
Step-by-step explanation:
A meteorologist predicted that Monday's hight temperature would be 76F and on Monday, the temperature reached 80F.
The percentage error will be
Percentage error=
(Exact value-Forecasted value)/exact value x 100
= 76-80/80 × 100
= -4/80 × 100
=4/80 × 100
= 400/80
= 5%
The percentage error is 5%.