# Need help with precalc homework!

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• Jan 12th 2008, 01:42 PM
Ethen21
Need help with precalc homework!
Ive been working these for awhile and I need some help.

1.Find the area of a rectangle that is 6 times as long as it is wide. Express your answer in terms of w, the width of the rectangle in feet.

2.Find the value of the change in a purse that contains 3 times as many nickels as pennies, 5 more dimes than nickels, and 4 more quarters than dimes and nickels combined. Express your answer in terms of p, the number of pennies.

3.Mary has \$5.90 in nickels, dimes, and quarters. If she has twice as many dimes as quarters and 8 more nickels than dimes, how many coins of each type does she have?

4.A 1.5-acre building is 5 times as long as it is wide. What are its dimensions? (Note: 1 acre = 43,560 ft2.)
2 answers for this one, smaller dimension and larger one

5.A jeweler has 7 rings, each weighing 22 g, made of an alloy of 10% silver and 90% gold. He decides to melt down the rings and add enough silver to reduce the gold content to 76%. What is the amount of silver to be added?
answer must be given in grams

6.If Ben invests \$4200 at 3% interest per year, how much additional money must he invest at 4.5% annual interest to ensure that the interest he receives each year is 3.5% of the total amount invested?

thanks for any help
• Jan 12th 2008, 01:54 PM
topsquark
Quote:

Originally Posted by Ethen21
Ive been working these for awhile and I need some help.

1.Find the area of a rectangle that is 6 times as long as it is wide. Express your answer in terms of w, the width of the rectangle in feet.

2.Find the value of the change in a purse that contains 3 times as many nickels as pennies, 5 more dimes than nickels, and 4 more quarters than dimes and nickels combined. Express your answer in terms of p, the number of pennies.

3.Mary has \$5.90 in nickels, dimes, and quarters. If she has twice as many dimes as quarters and 8 more nickels than dimes, how many coins of each type does she have?

4.A 1.5-acre building is 5 times as long as it is wide. What are its dimensions? (Note: 1 acre = 43,560 ft2.)
2 answers for this one, smaller dimension and larger one

5.A jeweler has 7 rings, each weighing 22 g, made of an alloy of 10% silver and 90% gold. He decides to melt down the rings and add enough silver to reduce the gold content to 76%. What is the amount of silver to be added?
answer must be given in grams

6.If Ben invests \$4200 at 3% interest per year, how much additional money must he invest at 4.5% annual interest to ensure that the interest he receives each year is 3.5% of the total amount invested?

thanks for any help

Your original thread was in a good spot as far as I'm concerned. Here are answers to 1 and 2.

-Dan
• Jan 12th 2008, 02:25 PM
Ethen21
thanks dan! any idea how to do these?

A man is walking away from a lamppost with a light source h = 9 m above the ground. The man is m = 1.7 m tall. How long is the man's shadow when he is d = 10 m from the lamppost?

Stan and Hilda can mow the lawn in 16 min if they work together. If Hilda works twice as fast as Stan, how long does it take Stan to mow the lawn alone?

Two cyclists, 99 mi apart, start riding towards each other at the same time. One cycles just as fast as the other. If they meet 4 hr later, at what average speed is each cyclist traveling?

_______mi/hr (slower cyclist)
_______mi/hr (faster cyclist)

A rectangular parcel of land is 60 ft wide. The length of a diagonal between opposite corners is 13 ft more than the length of the parcel. What is the length of the parcel? (Round the answer to one decimal place.)
• Jan 12th 2008, 03:10 PM
Ethen21
nvm i figured them out
• Jan 12th 2008, 07:46 PM
Jhevon
Quote:

Originally Posted by Ethen21
nvm i figured them out

as in figured EVERYTHING else out?
• Jan 12th 2008, 07:56 PM
Ethen21
i got the help i needed for everything so far.

thanks!