If you can draw one straight line through a polygon and cross more than two sides, the polygon is
a. concave
b. convex
c. regular
d. equiangular

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

The average daily maximum temperature for laura’s hometown can be modeled by the function f(x)=4.5sin(πx/6)+11.8 , where f(x) is the temperature in °c and x is the month. x = 0 corresponds to january.what is the average daily maximum temperature in may? round to the nearest tenth of a degree if needed.use 3.14 for π .

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?