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om paid $90 for 1 watch and 2 calculators.each calculator cost 1/4v as much as a watch. how much did he pay for each watch
find the value of ab+bc+ac if (a+b+c) = 10 and (a^2+b^2+c^2) = 40
I would like to know if there is another method that exist to get the answer to this proportion problem below.
(y – 1)/(x+3)=3/4

4(y - 1) = -3(x+3) The result of cross multiplying.
4y – 4 = -3x - 9 Distribute 4 on the left and -3 on the right.
4y – 4 + 4 = -3x – 9 +4 add 4 from both sides
4y =-3x- 5 Divide both sides by 4
4 4
y= -3x - 5 or y =-3x-5
4 4
Find the future value, using the future value formula and a calculator. (Round your answer to the nearest cent.)
$656 at 5.5% compounded quarterly for 5 years
suppose cosx = -7/25 and tanY=15/8, where x is in the II quadrant and Y in the III Quadrant without calculator find the exact values of
a) sin(x-y); b) cos(x-y) c) tan(x-y)

2) prove that sqartroot 17 is irrational using the well ordering properties of the natural numbers
Adrian paid $112 for a few pens after the 20% discount. With the money he saved from the discount, he would be able to buy 4 more pens. Find the original price of one pen.
r=3, and 6=h which of the following is equal to 2 "pie" R squared+ 2 "pie" rh
36x^2+30x-36 is the product of 6x-4, and another. What is the other factor?
In commutative algebra, it is well known that, for any commutative noetherian ring R, (intersection) (rad R)n = 0. Show that this need not be true for noncommutative right noetherian rings.
Using the definition of rad R as the intersection of the maximal left ideals, show directly that rad R is an ideal.
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