Which expression is equivalent to 7 and 3/4 - 1/2

Which of these triangle pairs can be mapped to each other using two reflections?

Can someone me with these two circle theorem questions asap?

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.