An angle measures 91 degrees. the angle is

a)right
b)acute
c)obtuse
d)straight

Really need on these. i have no idea what to do

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)