Please answer the ones you know or all of them

What is the area of triangle pqr on the grid? a triangle pqr is shown on a grid. the vertex p is on ordered pair 7 and 6, vertex q is on ordered pair 1 and 6, and the vertex r is on ordered pair 4 and 2. 5 square units 6 square units 10 square units 12 square units

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Which of the following is true for the relation f(x)=2x^2+1