Two sides of a triangle are known to be 70 mm and 80 mm to the nearest millimetre. The angle included between these sides is 30°. Calculate: a)percentage errorin its area

Based on what i know about mean, this doesn't add up.

Can some one me with these questions

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.