At the museum you can buy 3 postcard for 5.40 6 postcards for 10.80 or 9 postcards for 16.20 what is the constant of proportionality for buying postcard

What is the multiplicative rate of change of the exponential function shown on the graph?

Plzzz i beg u so much asaaaap ! what is the slope of this line? enter your answer in the box.

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.