Which expressions are equivalent to 1/2 + 3c + 4/5 check all that apply

1. 3c + 4/5 +1/2

2. 1 + 2 + 3c + 4 + 5

3. 4/5 + 1/2 + 3c

4. 2 + 3c + 4

5. 1/2 + 4/5 +3c

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

Divide. write in the simplest form. 4 1/6 divided by 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)