25 is the answer of this problem
Answer:
Step-by-step explanation:No
Answer:
a² - 14a - 15 = 0 (quadratic equation)
Emily's age = 15 years
Tuli's age = 15 - 10 = 5 years
Step-by-step explanation:
let
Emily age = a
Tuli age = a - 10
Two years ago their ages will be as follows.
Emily's age = a - 2
Tuli's age = a - 10 - 2 = a - 12
The product of their ages 2 years ago is 39.
(a - 2)(a - 12) = 39
a² - 12a - 2a + 24 - 39 = 0
a² - 14a - 15 = 0 (quadratic equation)
To get a
a² + a - 15a - 15 = 0
a(a + 1) - 15(a + 1)
(a + 1)(a - 15)
a = -1 or 15
we can only use 15 as it is positive.
Right away, mode is not applicable because mode entails the repetition of the same number. No numbers are repeated here.
To find median, you must put the numbers in numerical order. You should get
111, 114, 121, 179, 216, 220, 234, 246
Next, find the middle. In this case, the middle is split between 179 and 216. To find the median, add 179 and 216 then divide by two. You should get 197.5.
To find the mean, add all the numbers then divide by the number of numbers present (in this case there are 8 numbers). You should get 180.125.
Because the median and mean are off, it is safe to say A is the correct choice.
