I have a learning disability it doesn't effect me until I try to do anything math related I just never get the concept so it would mean a lot if you could answer these questions and make it as easy as possible to understand how you did them thanks. how many groups of seven dogs can be selected from a group of 14?

out of 30 animals how many can you select from a group of 3?

there are 12 singers in a choir how many groups of four can you choose to sing?

in a club of 25 how many groups of five can you choose to run a bake sale?

The weibull distribution is widely used in statistical problems relating to aging of solid insulating materials subjected to aging and stress. use this distribution as a model for time (in hours) to failure of solid insulating specimens subjected to ac voltage. the values of the parameters depend on the voltage and temperature; suppose α = 2.5 and β = 190. (a) what is the probability that a specimen's lifetime is at most 250? less than 250? more than 300? (round your answers to four decimal places.) at most 250 less than 250 more than 300 (b) what is the probability that a specimen's lifetime is between 100 and 250? (round your answer to four decimal places.) (c) what value is such that exactly 50% of all specimens have lifetimes exceeding that value? (round your answer to three decimal places.) hr