X2 + 5x - 50 a) (x + 25)(x - 2) b) (x - 5)(x + 10) c) (x - 10)(x + 5) d) (x + 2)(x - 25)

The correct answer is B) (x - 5)(x + 10)

Step-by-step explanation:

The constants at the end of the parenthesis need to add to the middle term

10 + -5 = 5

And they need to multiply to the end term

-5 * 10 = -50

This makes it the correct choice.

b.an increase in a causes b to decrease

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.