Okay, I just need help understanding and getting the answers for a few questions.
1) A woman's dress originally selling for $50.00 was marked down to yield 20% on cost. If the original profit was 33 1/3% on cost, what will be the new sales price.
2) Find the compound interest on $1000 for 9 months at 8% per annum, interest being calculated quarterly.
[And then I have the expand crap... I seriously don't understand this guys Please pity me and help me out ]
You have to expand each of the following
3) a. (Y+3)(Y+4)
b. (2x-4)(x+8)
c. (7x-4)(3x-9)
d. (x-3)(x+3)
e. (x+3)(y-9)
4) Mr. Drake sold two books at $1.20 each. Based on the cost, the profit on one was 20% and the loss on th e other was 20% On the sale of the books, did he break even? Gain? Lost? Show how much he gained or lost.
5) There are 1600 pupils in a school. 3/8 of them are girls. 43% of the boys and 1/4 of the girls wear glasses. How many students in this school wear glasses?
6) If 12(exponent)x-4=1, What is the value of 3(exponent)x
7) If x is 3% of y and y is 7% of w, find x in terms of w.
Thanks!!!!!
Guys, I know this is alot Sorry, but mid-terms are really hard and I really need to understand this stuff :P Kindly try and answer as many questions as possible by tommorow =)
First terms:
Outer terms:
Inner terms:
Last terms:
So
<-- Adding up "like" terms
-Dan
NOTE: For a slightly more advanced explanation (which might help, might not) this is merely an application of the distributive law of multiplication over addition: a(b + c) = ab + ac.
Let's momentarily define a = y + 3:
Now, put back in a = y + 3:
Now use the distributive law again (twice):
(These two lines give use the terms in the FOIL expansion.)
Thus: