Mr. Alexander

This page lists questions and answers that were posted by visitors named Mr. Alexander.

Questions

The following questions were asked by visitors named Mr. Alexander.

How many 3-digit numbers have the units digit larger than the tens digit?

One leg of a right triangle has a length of 15 m. The other sides have lengths that are consecutive integers. Find the number of meters in the perimeter.

Suppose $A$ and $B$ are digits for which the product of the two-digit numbers $\underline{2A}$ and $\underline{AB}$ is 1971. Find the sum of $A$ and $B$. Note: This is LaTeX, so if you need to render it, then go ahead

Whenever Deven and Laura owe each other money, they "pay" each other using stickers. They've agreed that a Harry Potter sticker is worth 49 dollars and a Twilight sticker is worth 35 dollars. They can even use stickers as "change" if one person overpays t...

A wooden plank is 5 feet long and 1 1/2 inches thick. To make the plank 1 1/8 inches thick, a carpenter removes the same thickness of wood from the top and bottom of the plank. How many inches does the carpenter remove from the top of the plank? Express y...

The Master Chief collects spiders and starfish. If his spiders have 8 legs and his starfish have 5 legs, how many starfish must he have given that his spider/starfish collection totals 19 creatures and 116 legs?

Annie loves giving away puppies. When her friend Bobby walks by, she instantly gives him 50% of her puppy stash. Bobby, stunned with this shower of puppies, gives back 20% of his total. Annie counters by giving Bobby 50% of her new puppy total. Bobby resp...

A prime number less than 100 is selected randomly. What is the probability that its square has units digit 7?

(a) A cube is painted red on all six sides, then cut into 125 smaller congruent cubes. How many of the small cubes are painted red on exactly one side? (b) A cube is painted red on all six sides, then cut into 125 smaller congruent cubes. How many of the...

One member of the debate team is going to be chosen President. Each member is equally likely to be chosen. The probability that a boy is chosen is 2/3 the probability that a girl is chosen. Girls make up what fraction of the debate team?

Hi! I need urgent help for these questions here. They have a deadline for today and I have no idea how to solve them (a). Suppose we have a bag with 10 slips of paper in it. Eight of these have a 2 on them and the other two have a 4 on them. What is the e...

Suppose we have a bag with 10 slips of paper in it. Eight of these have a 2 on them and the other two have a 4 on them. What is the expected value of the number shown if we add two additional 4's (instead of just one) to the bag?

Suppose I have a bag with 10 slips of paper in it. Eight of these have a 2 on them and the other two have a 4 on them. How many 4's do I have to add before the expected value is at least 3.5?

Express $3.\overline{4}_{13}$ as a base 10 fraction in reduced form.

Find a base 7 three-digit number which has its digits reversed when expressed in base 9. (You do not need to indicate the base with a subscript for this answer.)

What is $1000000_{16} - 8D6A7B_{16}$ in base 16? (You do not need to include the subscript 16 in your answer.)

Answers

The following answers were posted by visitors named Mr. Alexander.

that was not quite right

try again please

I do not know very well. Help me~

Cause I tried entering the problem, it was wrong :(