What is the exact distance from (−4, −2) to (3, 8) on the coordinate plane?

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

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?

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.)