There will be 5 cookies made for every 2 cupcakes made. The club members plan on making 280 total baked goods. How many cupcakes will there be?

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

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)