Geometry is hard please help me D:

Jane is cooking beans and rice for dinner tonight. she has 4 cans of black beans, 6 cans of red beans, and 3 cans of garbanzo beans in her cupboard. if she grabs a can of beans without looking at the label, what is the probability of her making black beans and rice for dinner?

For what values of a is the sum of the fractions 2a−1 / 4 and a−1 /3 positive?

The population in a city is modeled by the equation p(d)= 100,000*(1+0.3) where d is the number of decades since 1970