In the 3-month period november 1, 2014, through january 31, 2015, hess corp. (hes) stock decreased from $80 to $64 per share, and exxon mobil (xom) stock decreased from $96 to $80 per share.† if you invested a total of $22,240 in these stocks at the beginning of november and sold them for $18,080 3 months later, how many shares of each stock did you buy?

170 HES and 90 XOM

Hi! Let's say you bought A HES shares, and B XOM shares. As you invested $22,240, yo have that:

    (80 and 96 are the initial prices)

3 months later those prices decreased to 64 and 80, and you sold your shares at those prices, then:

This is a system of two linear equations and two unkowns A, B. You can solve it getting A from first equation:

And then replacing A into the second equation you can find the value of B. Then replacing B in the third equation you get A.

answer:

total cost for tiles and paints is $924.  

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

given: 1m squared floor tiles costs $3. so,

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

therefore, the combined total cost of tiles and paint is $924.