Mrs. Fitzgerald rents a stall in a mall where she sells antiques. She earns a mean revenue of $ 500 $500dollar sign, 500 per month with a standard deviation of $ 125 $125dollar sign, 125. Her stall and new inventory costs her $ 225 $225dollar sign, 225 per month and are her only costs. She calculates her profits using this formula: profit = [revenue] − [costs] profit=[revenue]−[costs]start text, p, r, o, f, i, t, end text, equals, start text, open bracket, r, e, v, e, n, u, e, close bracket, end text, minus, start text, open bracket, c, o, s, t, s, close bracket, end text What will be the mean and standard deviation of the distribution of Mrs. Fitzgerald's profits? Choose 1 Choose 1 (Choice A) A Mean: $ 275 $275dollar sign, 275 Standard deviation: $ 125 $125dollar sign, 125 (Choice B) B Mean: $ 275 $275dollar sign, 275 Standard deviation: $ 350 $350dollar sign, 350 (Choice C) C Mean: $ 500 $500dollar sign, 500 Standard deviation: $ 125 $125dollar sign, 125 (Choice D) D Mean: $ 500 $500dollar sign, 500 Standard deviation: $ 350 $350

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

hello from mrbilldoesmath!

answer:   (7x + 6y) ( 49x^2 - 42xy + 36y^2)

discussion:

in general, the factorization of a^3 + b^3 is

a^3 + b^ 3 = (a + b) ( a^2 - ab + b^2)

in our case note that 343 = 7^3 and 216 = 6^3 so the equation becomes:

343x^3 + 216y^3 = (7x)^3 + (6y)^3

if you think of a (above) as 7x and b as 6y the factorization becomes

343x^3 + 216y^3 =

((7x + 6y) (   (7x)^2 - 7x*6y + (6y)^2)   =

(7x + 6y) ( 49x^2 - 42xy + 36y^2)

you,

mrb

(a + b) (a^2 - a b + b^2)

third choice down

step-by-step explanation:

the first inequality is based on the number of adults and campers, and the second inequality is based on the cost of feeding both the adult and the camper.

we know that there is room for 525 people max.   it's ok to have less than 525, but it's not ok to have more than 525, so the inequality is less than or equal to.   the number combination of adults (x) and campers (y) cannot exceed this 525 max.   therefore:

x + y ≤ 525

now we talk about cost.   it costs $9 to feed one adult, so depending upon the number of adults you have (x) depends upon how much it will cost to feed that number of adults.   same with the campers, who cost $5 to feed.   the adults can be represented by 9x and the campers can be represented by 5y.   since the budget cannot exceed 1,200, the second inequality is:

9x + 5y ≤ 1200