Pls help me with this
A bag contains 10 marbles: 2 are green, 5 are red, and 3 are blue. Amanda chooses a marble at random, and without putting it back, chooses another one at random. What is the probability that the first marble is red and the second is blue? Write your answer as a fraction in simplest form.

What is the relationship between all triangles that can be drawn given the same three angles

The fraction of defective integrated circuits produced in a photolithography process is being studied. a random sample of 300 circuits is tested, revealing 17 defectives. (a) calculate a 95% two-sided confidence interval on the fraction of defective circuits produced by this particular tool. round the answers to 4 decimal places. less-than-or-equal-to p less-than-or-equal-to (b) calculate a 95% upper confidence bound on the fraction of defective circuits. round the answer to 4 decimal places. p less-than-or-equal-to

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.