I suck at this type of math because the teacher did not explain good enough and I’m stuck.

Tanya has $42 to spend at the dolphin island store. tshirts sell for $7 each and a pair of sunglases sells for $6.tanya buys 3 tshirts. how many pairs of sunglases can she buys with the amount of money she has left

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)