2 3/20 ,2 9/20, 2 1/2,2 11/20,2 4/5
Answer:
5,040 different passwords are possible
Step-by-step explanation:
Assuming that 4-digit means using only numeric values.
This is a permutations problem.
n = number of values used with number values only this is 10
r = the number used in each case without repeating in this case 4
nPr = n! / (n - r)!
nPr = 10! / (10-4)!
nPr = 10! / 6!
The ! means factorial. For example 4! = 4 x 3 x 2 x 1 = 24
A quick hack for dividing factorials is to use cancelling.
10! / 6! = 10 x 9 x 8 x 7 (because 6 to 1 are cancelled by 6!)
= 5040
Answer:
what do you need help with?
Step-by-step explanation:
We are given dimension of billboard as 30 feet by 18ft.
since billboard is a rectangle so Area =l *b
Area of billboard = 30*18=540 feet square
1 gallon of paint covers 250 square feet
so for 540 square feet paint needed = 540/250 = 2.16 gallons
Answer: 2.16 gallons should be purchased to cover the entire billboard
Answer:
-1.778
Step-by-step explanation:
The two lines cross at the point (-1.778,-4.333), but the x value is -1.778
Hope this helps