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For how many positive integers $a$ is $a^4−3a^2+9$ a prime number?

Awarded May 21 at 10:36

If $x$ and $y$ are positive numbers less than $20$ for which $x+y+xy=76$, what is $x+y$?

Awarded Feb 10 at 2:26

Probability - What is the probability that the two-digit number is a multiple of 3

Awarded May 13, 2021 at 15:05

A four-digit number is chosen at random from all four-digit number

Awarded Jan 22, 2021 at 23:21

how many distinct values does it have?

Awarded Apr 4, 2020 at 7:40

what is the largest possible value of N?

Awarded Feb 4, 2020 at 18:00

what is the smallest possible value of the other number

Awarded Oct 4, 2019 at 16:15

how many ways is it possible to seat eight people at a round table ...

Awarded May 6, 2019 at 3:00

How many positive two-digit integers have exactly 8 positive factors?

Awarded Jan 20, 2019 at 14:10

Find the remainder when $11^{12}$ is divided by $13$. [duplicate]

Awarded Nov 22, 2018 at 19:25

find the largest number

Awarded Sep 5, 2018 at 4:30

What is the sum of the $81$ products in the $9 \times 9$ multiplication grid?

Awarded Aug 28, 2018 at 18:55

A number is divisible by 13 [duplicate]

Awarded Mar 17, 2018 at 18:39

What is the smallest composite number

Awarded Oct 10, 2016 at 3:47

What is the sum of all positive even divisors of 1000?

Awarded Sep 12, 2016 at 14:46

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