The triangle below has a total perimeter of 450 cm:
picture of a triangle with sides 128 and 150. third side unknown
write an equation and solve it to find the length of the longest side of the triangle.

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)

I'm confused on this could anyone me and show me what i need to do to solve it.