Answer:

» Collect like terms, r terms on the left hand side by subtracting r from both sides and adding st to both sides

» On the left hand side, factorise out r

Answer: 18/7
Step-by-step explanation: random.
Answer:
circumference of a circle: pi*d
d is also 2r (2 times the radius)
Answer:
315
Step-by-step explanation:
7/4 of 180°
= 1.75 * 180
= 315°
Answer:
x= 60
Step-by-step explanation: