Mary works selling cards over the telephone. She sells two types of cards: birthday cards and holiday cards. Mary makes $2 for each pack of birthday cards she sells and $2.50 for each pack of holiday cards she sells. She
can work no more than 10 hours per week and it takes her an average of 15 minutes to sell one pack of birthday
and an average of 20 minutes to sell one pack of holiday cards. If she can sell no more than 35 packs of cards,
how many packs of each type of card should she sell to make the most money?

she makes her most revenue when she sells 20 birthday cards and 15 holiday cards for revenue of 77.5 dollars.

(3x-8) or (3x+8)

step-by-step explanation:

you are playing an adventure game on your computer. you come across a troll who won't let you pass and there is no other way to get to the other side of the river except over the bridge he is guarding.

the troll is a nerd. he takes great delight in watching people struggle with his problems. very few get them. he only gives you one chance and then he changes the puzzle. you have to solve this one.

before you are four blocks. they are numbered 11,6, -7,21.

he tells that the answer he wants is minus and between -1 and - 2. you can use +, -, ×, ÷   ( and ) as many times as you like or no times at all. you don't like the way he's looking at you, but you need to cross the bridge. what do you do?