What is true about this sequence???

Afruit stand has to decide what to charge for their produce. they need $10 for 4 apples and 4 oranges. they also need $15 for 6 apples and 6 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

On a piece of paper graph f(x)=5•(0.4)^x

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?