Classify the side lengths a, b, &c as acute, right, obtuse, or not a triangle: 8,15,19

What is the value of the digit 1 in the number 13?

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.)

Zach spent 2/3 hour reading on friday a 11/3 hlurs reading on saturday. how much more time did he read on saturday tha on friday