(-1,-9) and (2,21) into an equation

y=10x+1

Step-by-step explanation:

subtract to get a slope of 10

insert the slope into the equation with one of the points. 21=10(2)+b

then solve 21=20+b   b=1

place slope and y-intercept ito the equation. y=10x+1

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%