6. BIRDS A bird call manufacturer sold 8 · 4 · 4 · 8 · 4 calls in two months. How many calls did the manufacturer sell? 7. RIVER The St. Johns River is 2 · 5 · 31 miles long. About how many miles long is the river? 16. HEIGHT The table shows the heights of four sixth grade students. Find the prime factorization of each height. Student Height (in.) Oksana 59 Silvia 62 Joseph 64 Diego 66