Which of the following is x⁴ + y⁴ identically equal to?
(a) (x² + y²)(x + y)(x - y)
(b) (x² + xy + y²)(x² - xy + y²)
(c) (x² + √2xy + y²)(x² - √2xy + y²)
(d) (x² + √3xy + y²)(x² - √3xy + y²)
(e) (x + y)²(x-y)²
can someone explain me how to make it step by step?

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

Which of the following correctly justifies statement four of the two column proof? a. corresponding angles theorem b. transitive property of equality c. vertical angle theorem d. substitution property of equality

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample