She must have a score greater than 69 in her final tests
Let the required score be "x"
<h3>What is Mean?</h3>
The mean of the data is the ratio of the sum to the total sample
Mean = 80+76+85+85+x/5
80+76+85+85+2x/5 > 79
326+x/5 > 79
326 + x > 395
x > 395 - 326
x > 69
This shows that she must have a score greater than 69 in her final tests
Learn more on mean here: brainly.com/question/1136789
Answer:
The fourth term of the expansion is -220 * x^9 * y^3
Step-by-step explanation:
Question:
Find the fourth term in (x-y)^12
Solution:
Notation: "n choose k", or combination of k objects from n objects,
C(n,k) = n! / ( k! (n-k)! )
For example, C(12,4) = 12! / (4! 8!) = 495
Using the binomial expansion formula
(a+b)^n
= C(n,0)a^n + C(n,1)a^(n-1)b + C(n,2)a^(n-2)b^2 + C(n,3)a^(n-3)b^3 + C(n,4)a^(n-4)b^4 +....+C(n,n)b^n
For (x-y)^12, n=12, k=3, a=x, b=-y, and the fourth term is
C(n,3)a^(n-3)b^3
=C(12,3) * x^(12-3) * (-y)^(3)
= 220*x^9*(-y)^3
= -220 * x^9 * y^3
Answer:
option d is correct
Step-by-step explanation:
hope this helped
Answer: yes
Step-by-step explanation:
Answer:
2.25 or 2 1/4 hours
Step-by-step explanation:
To answer this, we simply have to divide the number of hours spent studying by the number of days before the test. And since 6 3/4 is in fraction form, we will convert to decimal because it makes it easier to multiply that way:
6.75 ÷ 3 = 2.25
So, Andrea studied for 2.25 or 2 1/4 hours each day before her test
Hope this helps :)