Jeremy practiced tennis 19.5 hours. in one week, excluding Sunday. Each day he practiced 30 minutes more than the day before. How long did he practice on the third day?

please can someone answer this and show how they got their answer

Which expression is rational? 6. , square root two, square root 14, square root 49

Which of the following vectors are orthogonal to (2,1)? check all that apply

Asoftball team played ten games, scoring 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 runs. they lost by one run in exactly five games. in each of their other games, they scored twice as many runs as their opponent. how many total runs did their opponents score?