Alana is 4 years older than her brother ernie. ernie is 2 years older than their sister amelia. amelia is 10 years younger than their brother marzo. if marzo is 17 years old, how old is alana ?

Complete the steps, which describe how to find the area of the shaded portion of the circle. find the area of the sector by multiplying the area of the circle by the ratio of the to 360. subtract the area of the triangle from the area of the sector.

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.