Write the ratio as a ratio of whole numbers in lowest terms $1.50 to $0.90

With #! i’ve tried to figure it out but i can’t.

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

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)