At the store, you buy some pencils for $0.50 each and some pens for $1.50 each. You spend a total of $12 and purchase 16 items (pencils and pens only). (a) Write and solve a system of equations that...

At the store, you buy some pencils for $0.50 each and some pens for $1.50 each. You spend a total of $12 and purchase 16 items (pencils and pens only). (a) Write and solve a system of equations that...

Kinetic energy varies jointly as the mass and the square of the velocity. A mass of 15 grams and velocity of 7 centimeters per second has a kinetic energy of 147 ergs. Find the kinetic energy for...

For each $6 decrease in price, the store expects to sell eight more calculators.The revenue from calculator sales is given by the function R(n) = (unit price)(units sold), or R(n) = (120 - 6n)(80...

Please help me, I am having a hard time answering this question. Thanks

A certain element has a half life of 4.5 billion years. a. You find a rock containing a mixture of the element and lead. You determine that 20% of the original...

A paper mill makes newsprint, bond, and copy machine paper. Each ton of newsprint requires 3 tons of recycled paper, and 1 ton of wood pulp. Each ton on bond requires 2 tons of recycled paper, and...

Omar biked from school to the park at an average speed of 9 miles per hour, and then biked back the same way at an average speed of 8 miles per hour. If the round trip took 1 hour, how many...

A paper mill makes newsprint, bond, and copy machine paper. Each ton of newsprint requires 3 tons of recycled paper, and 1 ton of wood pulp. Each ton on bond requires 2 tons of recycled paper, and...

maggie bought c CD's for $8 each, b books for $11 each and a purse costing $36. Write an expression to show the total amount of money Maggie spent.

Need help with this one where do i begin

Please tell me how to solve this problem and all the steps required with it.

You are buying orange juices for 245 dollars per container and have a gift card worth 20 dollars. The function f(x)=245x-20 represents your total cost f(x) if you buy x containers of orange juice...

I`m able to get about half of this problem, but i just cant seem to get though it. Please help. Members of an executive committee of a math conference. Alan, Amy, Jessica, and Julia were...

hiking to tower from camp took 2 hrs longer than hiking back at 6mph . how many miles one way and how long

sixth grade problem

help me please

I'm confused because it says selling price twice but seems to be referring to two different things. When I try to work the problem the way I learned it the problem won't solve. This is how I've been...

Kai takes off from parking structure 1 at 3:00 PM, driving north. One hour later, Jacob takes off from parking structure 1, too, but he had south, and his speed is 15 mph more than Kai's. At...

A certain element has a half life of 2.5 billion years. a. You find a rock containing a mixture of the element and lead. You determine that 55% of the original element remains; the other...

if x is 6 less than y and y is twice of z then what is the value of x when z = 2