Step-by-step explanation:

Answer:
1) b would be easier because it’s 1/2bh and since the base of 10 is easily divisible by 2 you don’t have to deal with fractions.
D=sqrt (x2-x1)^2+(y2-y1)^2
D=10
Step-by-step explanation:
Answer: (n2+1) (n+1) (n-1)
Step-by-step explanation:
Answer: 90 and 60
Step-by-step explanation:
90 x 2 = 180
60 x 3 = 180