The answer is C. 81.49 !!
3/4, 12/16 are equal to 6/8.
9514 1404 393
Answer:
(x, y) = (7, -1)
Step-by-step explanation:
The expression for x makes it easy to use that for substitution.
3(-7y) +y = 20
-20y = 20 . . . . . collect terms
y = -1 . . . . . . . . . divide by -20
-7(-1) = x = 7 . . . use y in the second equation to find x
The solution is (x, y) = (7, -1).
Answer:
Sprint: c=0.15t+29.95
AT&T: c=0.39t+4.95
"c" is the cost per month
"t" is the number of texts per month
Step-by-step explanation:
The standard deviation of the data set is D. ABOUT 13.4
14, 34, 23, 50, 25, 16, 48
Arrange in ascending order: 14, 16, 23, 25, 34, 48, 50
mean = (14 + 16 + 23 + 25 + 34 + 48 + 50) / 7 = 210/7 = 30
|14 - 30| = 16 ⇒ 16² = 256
|16 - 30| = 14 ⇒ 14² = 196
|23 - 30| = 7 ⇒ 7² = 49
|25 - 30| = 5 ⇒ 5² = 25
|34 - 30| = 4 ⇒ 4² = 16
|48 - 30| = 18 ⇒ 18² = 324
|50 - 30| = 20 ⇒ 20² = 400
(256 + 196 + 49 + 25 + 16 + 324 + 400) / 7 = 1,266/7 = 180.85 variance
√180.85 = 13.45 standard deviation.
