4. A pizza shop sells pizzas that are 15 inches (in diameter) or larger. A 15-inch cheese pizza costs $12. Each additional inch costs $3, and each additional topping costs $1.25.
Write an equation that represents the cost of a pizza. You must list what each variable
represents

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

How can you tell when x and y are not directly proportional?