15 miles jogged in 3.75 hours

What is the number 321,000,000 in scientific notation? also what is the number? ?

Use sigma notation to represent the following series for 9 terms.

Acampus club held a bake sale as a fund raiser, selling coffee, muffins, and bacon and eggs sandwiches. the club members charged $1 for a cup of coffee, 3$ for a muffin , and $4 for a back. and egg sandwich. they sold a total of 55 items , easing $119. of the club members sold 5 more muffins than cups of coffee, how many bacon and egg sandwiches he’s did they sell