Rewrite 7^-2 with its positive exponent equivalent

Antonia and carla have an equivalant percentage of green marbles in their bags of marbles. antonia has 4 green marbles and 16 total matbles. if carla has 10 green marbles , how many total marbles does carla have

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x