Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number.
the probability that the locker code begins with a prime number is what
%. the probability that the last digit of the locker code is an odd number is what
%.

The probability that the locker code begins with a prime number is:

2/5 = 40%

The probability that the last digit is an odd number which will make the locker code an odd number is:

3/5 = 60%

Step-by-step explanation:

According to the given statement Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number.

Therefore the digits that can be used in the code are 5,6,7,8 or 9.

A) The probability that the locker code begins with a prime number is what  %.

Two of the digits are prime number: 5 and 7

Thus the probability that the locker code begins with a prime number is:

2/5 = 40%

B) The probability that the last digit of the locker code is an odd number is what  %.

If the last digit is an odd number than the locker code is an odd number.

There are three odd numbers: 5,7,9

Thus the probability that the last digit is an odd number which will make the locker code an odd number is:

3/5 = 60%

(-1,-0.5)

step-by-step explanation:

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10