Answer:
A rectangular pyramid
Step-by-step explanation:
Step-by-step explanation:
x+1(3x3+3x2+5x−1)⋅(x−1)
so this is the answer -------> x + 1
30k + 70 = 20k + 80
30k - 20k = 80 - 70
10k = 10 / : 10
<u>k </u><u>=</u><u> </u><u>1</u>
Answer:3
Step-by-step explanation:
1+5=6
6/2=3
<u>We are given:</u>
The time-traveller has 79 books, but he can only take 5 books
since we need to find the number of ways he can choose 5 books, we know that the order in which he takes the books does NOT matter
Hence, we will use combination
<u>Finding the number of ways:</u>
Since we will use combination, ₇₉C₅
We know that the formula for combination is (n!) / (r!(n-r)!)
₇₉C₅ = 79! / 5!(74!)
₇₉C₅ = 22,537,515
Therefore, the time traveller can choose 5 books in 22,537,515 different ways