A computer store buys a computer system at a cost of 474.60 ​$. The selling price was first at 791 ​, but then the store advertised a markdown on the system. Answer parts a and b. THIS IS ALSO DUE TONIGHT!!

a: 543.2 b: 465.6

Step-by-step explanation:  

a. find 30% of $776, which is 232.8. subtract 232.8 from 776.

b. find 40% of $776, which is 310.4. subtract 310.4 from 776

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last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b