822 19 12 18 19 10 35 12 19 16 21 put in number order and extra perk if you find the median

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

Which number completes the inequality? 2/3 < _ < 7/9

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.