(7.87×10⁻¹)⁻⁶ PLS ANSWER, IT'S SCIENTIFIC NOTATION AND I DON'T KNOW HOW TO DO THESE TYPES OF PROBLEMS. PLEASE ADD AN EXPLANATION ON HOW TO DO IT AS WELL

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

Find the missing variable for a parallelogram: a = latex: 28in^2 28 i n 2 h = b = 6.3 in (1in=2.54cm)