In 2015 the population of city x and city y were equal

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

Simplify the expression 10/11(22z) + (a+5) -1

The larger of two number is 4 less than twice the smaller number. the sum is 41. find the numbers