Askirt that usually sells for $40 is on sale for $30. what is the discount percent? a) 20% b) 25% c) 27% d) 30%

That would be B) 25% off. Hope this helps!

Using "x" as the unknown, the equation would be 40x=30. Solving for x, you get ".75" or 75% meaning that 30 is 75% of 40. The discount, is just the difference between "x" and 100%, so 100%-75% is 25%. The answer is (B) 25%.

X^4 + 36x^2 = x^2(x^2+36)= x*x*(x+6i)(x-6i) mark me brainliest