Which of these divisibility rules can be applied to determine if 315 is a prime or composite number?
a a number is divisible by 4 if the last two digits are divisible by 4.
b none of these rules can be applied because 315 is a prime number.
c a number is divisible by 9 if the sum of its digits is divisible by 9.
d a number is divisible by 6 if it is divisible by 2 and 3.
awnser

7.25

step-by-step explanation:

we know that 7 equals to 7.0. we also know that 1/4=0.25. so we can add the two together and we get 7.25

69.64%

step-by-step explanation:

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours

v=1788.75

step-by-step explanation:

i belive that is the answer