Which of the following equations demonstrate that the set of polynomials is not closed under the certain operations?
a. addition: (x^2+x)+(x+1)=x^2+2x+1
b. division: (x^2-5x+3)/(x-2)=x-3+-3/x-2
c. multiplication: (x^2-5x+3)(x-5)=x^3-10x^2+28x-15
d. subtraction: (3x^4+x^3) - (-2x^4+x^3)=5x^4

answer:   expression= p+p*d%

price reduction + sale price = $625

sale price: $p+$p*d%

where d% is the percentage of discount

step-by-step explanation:

original price = p

price went down by $150 price reduction $p*d%

sale price= $ 475

therefore the price before sale is: $625

and the expression that shows the price before sale is: p+p*d%

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like:

answer:   2 multiplied by x =24

step-by-step explanation: