Given: x + y = 10. If x = -21, what is y?
-31 or 31?

y = 31

Step-by-step explanation:

x + y = 10

Let x = -21

-21 + y = 10

Add 21 to each side

-21+21 +y = 10+21

y = 31

one of each metals

step-by-step explanation:

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%