What is the correlation coefficient r for the data set? Enter your answer to the nearest hundredth in the box.

r=

x y
25 240
26 242
27 230
28 229
28 220
28 219
29 200
30 202
31 184
32 180

I think its -0.95 but im not sure. please explain

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

47 - 90 = 43

43 - 180 = x

x = 137

(hint): the answer is in the question.