What is the domain of the following parabola?

u-shaped graph that opens down with a vertex of 1, 2

x ≥ 1
x ≤ 1
all real numbers
y ≤ 2

Find the solution of this system of equation -7x+y=-20 9x-3y=36

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

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document