TeacherJim

Afterthought: careful with that lettter! You don't want to use f again, because the variable you're looking for is not the price of a seat. f has already been used for the price, so using it for the number of seats is confusing. Pick another variable, lik...

15 years ago

You're welcome!

15 years ago

All correct, except the second question 4. You know: "auditorium A, and they sold only floor seats. A total of 3981.25 was collected" In your answer, you made f into a variable, and that answer would be right if f was variable and if they had sold all 200...

15 years ago

I agree with your first part: b=2^(1/4) = 1.189207. Now, after 3 days, according to the question, we must have 84.089 spiders - wonder what .089 of a spider looks like? - and after 8 days, we have 100. If S0 is the number of spiders on day zero, and s is...

15 years ago

You didn't make a mistake: "Eight days after moving in, there were four times as many termites as spiders" But 100 * (2^.25)^8 = 400 (termites) So if there were 400 termites, there were 100 spiders. So how do we get s? S0 * s^3 = 84.089 S0 * s^8 = 100 (S0...

15 years ago

Yes!

15 years ago

Compilers usually tell you where the errors are. Some part of the output or screen should be saying something about a line number, or if you click on the error message in an IDE, it really should bring you to the line. The only error I can see looks like...

15 years ago

Multiply the -3 into the brackets: -3(2x-7)-12+10x = -6x + 21 - 12 + 10x and then add the xes and the integers

15 years ago

You really have to write these down, one by one, and rearrange them in the order that they link to each other, to make sense of them. When you've got too much information to take in at one time, you need to stop, write each piece down, understand each one...

15 years ago

OK. That would imply that the compiler isn't seeing the lines int integer1; int integer2; or, more precisely, isn't seeing them as declaring local variables at that point. Is it possible you've changed something unintentionally in trying to find a fix? I...

15 years ago

Great! I can' see the code I pasted a minute ago now. Dunno how that happened. Anyway, get used to it! :-) One of the peculiarities of programming is that sometimes things mysteriously don't work, and then mysteriously do when you look at them again. Actu...

15 years ago

Correct! (but maybe not complete) 8 checks per month cost $2.40 under either plan, and after that each check in the accucheck plan is cheaper. But, careful - that's not any number of checks greater than 8; it's any number of checks greater than 8 <b>per m...

15 years ago

jessica, bring the x terms together and the simple numbers together, then you can just divide across: -10.8x + 1.4 = -47.6 - 1.0x -10.8x + 1.0x = -47.6 - 1.4 -9.8x = -49 x = -49/-9.8 Check my arithmetic, and finish from there.

15 years ago

chandice, it's better to post a new message when you have a new question. Anyway, the discriminant of a quadratic is b^2-4ac, the bit inside the square root sign of the quadratic formula. In this case: b^2-4ac =7^2-4*5 which is greater than zero. What doe...

15 years ago

The hint gives the whole game away! Compare: while((beginP < myArray.length) && (myArray[beginP]==BLUE)) with while(myArray[endP]==GREEN){ What happens if GREEN is at the end of the array?

15 years ago

Well, everything divides by 4, so you can take that out for a start, leaving x^3 - 9x^2 + 24x - 16 We need three numbers with a product of -16 (1, 2, 4, 8 and 16 are the only possibilities) that sum to -9. Shouldn't be too hard to figure out from there.

15 years ago

Yes, though I would order them more clearly: x= -3, y= -4 and x=2, y= 6

15 years ago

Yes, all correct!

15 years ago

You're welcome!

15 years ago

(3/x)-1 = 7/(x-20) Looks nasty, I agree, but it's not as bad as it looks! Multiply across by x(x-20) and you are left with (3-x)(x-20) = 7x which expands out into a neat quadratic with two friendly numbers as your solutions.

15 years ago

Since we're talking specifically about computers, I presume, there are risks other than just having the equipment lifted directly. A common theft, for example, is to remove memory or other components from the machine, leaving the machine there until someb...

15 years ago

We start at $320 50% is half, so the desk is reduced by half. That one's easy. 20% is 20/100 = 1/5, so you need to find 1/5 of the reduced price of the desk you worked out above, and subtract that from the reduced price. Is that enough?

15 years ago

If you take an element and cut it into the smallest piece that is still that element, you have an atom of that element. All atoms are made of protons, neutrons and electrons, but those can be rearranged to make atoms of any element, so a neutron on its ow...

15 years ago

y = -1777x + 27153 1 year after 2000 would be 2001 2006 and 2007 would be ? and ? years after 2000 respectively. So we substitute these numbers for x, to get y = -1777 * 6 + 27153 and y = -1777 * 7 + 27153 Calculate those out for your answers. The last pa...

15 years ago

How many oz. in a lb.? 16 so if 1 oz is 14c, then a pound will be 16 * 14c How much is that? and you have your answer!

15 years ago

We don't know! Maybe he started at one mile a week, and increased that by a mile a week every week, or a mile a week every month. Or maybe he started at 15 miles a week, and increased by three miles a week each week. There isn't enough information in the...

15 years ago

Let the tens digit be x. Then the hundreds digit is 2x. The sum of these two digits is 3x, and that has to be less than 9, so x must be less than 3 - that is, the tens digit must be 1 or 2. So we might have: 42U or 21U where U is the Units digit. The digi...

15 years ago