A square on a coordinate plane is translated 9 units down and 1 unit to the right. Which function rule describes the translation? T1, –9(x, y) T–1, –9(x, y) T–9, 1(x, y) T–9, –1(x, y)

it would open into a square depending on the type of envelope i’m not sure about the second part

the answer is  

d.

21

i did this one. so you should get it right.

in counting the number of heads in 4 coin flips, the probability that we get exactly one head is the probability that we get anyone of the following 4 outcomes: httt, thtt, ttht, or ttth. each has probability 1/16, so the probability to get exactly one head in 4 flips is 1/16 + 1/16 + 1/16 + 1/16 = 4/16 = 1/4.