Tutors Answer Your Questions about expressions (FREE)
Question 1109814: A company producing CDs for home computers finds that the total daily revenue for selling x items at p dollars per item is given by R(x) = 9x − 0.01x^2. Use the fact that R = xp and your knowledge of factoring to find a formula that gives the price p in terms of x.
p = ?
Use the formula to find the price they should charge if they want to sell 420 items per day.
Click here to see answer by MathLover1(20850)  |
Question 1110295: Evaluating expression. My textbook has two problems; b^2 (squared) and (b)^2 where b is -2, to show apply exponent first and then apply the - sign so you get -4 in the first case. The second case is the (-2)^2, so you get +4 since the - sign is enclosed so you apply the - sign value to the squaring. Later on the page it has 3b^2 (squared). So I read this as 3 times b^2, so it would be 3 times -2^2. Which would be; square the 2, apply the - sign and multiply by 3. 3(-4)= -12
Other people say the answer is -2^2 to get +4 and then multiply by 3.So 3(+4)=+12 If the first example shows to apply the exponent before negation, then shouldn't the question be written "evaluate 3(b)^2? to get +12?
Click here to see answer by greenestamps(13203)  |
Question 1112637: A boulder stops a surveyor from directly measuring the boundary AB of a piece of land. He measures AC=500 feet and extends it 10 feet to a point D. BC turns out to be 600 feet and extending it 12 feet to reach point E. What is the length of AB if ED is 8 feet?
Click here to see answer by KMST(5328)  |
Question 1113409: Jason is going bowling with his friends. He rents bowling shoes for a one-time fee of $4.50. Jason then needs to pay $4.00 per game of bowling. Write an expression that represents the total cost, in dollars to rent the bowling shoes and bowl g games
Click here to see answer by amalm06(224)  |
Question 1117436: I don't know if this question would fall into this topic, but can someone help me? I'm self-reviewing for my college entrance exam which is already coming, and I encountered this problem in a book I'm reading.
Use set-builder notation to represent set D = (red, blue, yellow).
My answer was: D = (red, blue, yellow | red is a primary color). Is this one correct or?
Another one from the rule method problem is:
Use the rule method to represent (April, June, November, September).
My answer was: A is the set of months of the year.
Roster method and Rule method are kind of easy to understand for me, but I get quite confused when it comes to set-builder notation. Hoping that you could help me. Thank you in advance! :D
Click here to see answer by ikleyn(52832)  |
Question 1118360: Ok, this may sound absurd, but it makes a difference.
If: x = 3/4, and the expression is (12x^2), how should that be written?
I've tried it numerous ways:(12(3/4)^2), and (12 3/4^2).
Each way produces a drastic result.
Thank you!
Click here to see answer by greenestamps(13203)  |
Question 1118360: Ok, this may sound absurd, but it makes a difference.
If: x = 3/4, and the expression is (12x^2), how should that be written?
I've tried it numerous ways:(12(3/4)^2), and (12 3/4^2).
Each way produces a drastic result.
Thank you!
Click here to see answer by Alan3354(69443)  |
Question 1118571: Question on evaluating expressions:
The expression is 30x2^y
x=-2/5 and y= 5/8
I believe it should be solved as follows:
30-(2/5)^2 x 5/8 which = 299/10
Is this the correct way to evaluate the expression? I've never seen one like this before so I'm guessing.
Thank you!
Click here to see answer by t0hierry(194)  |
Question 1118570: Good morning,
Quick question about fractions in expressions. The question is as follows:
If x=-2/5 and y=5/8
What is: 30x^2y?
I believe it should be solved like this:
30 -(-2/5)^2 x 5/8
which gives and answer of: 299/10
Am I evaluating this correctly?
Thank you!
Click here to see answer by t0hierry(194)  |
Question 1118570: Good morning,
Quick question about fractions in expressions. The question is as follows:
If x=-2/5 and y=5/8
What is: 30x^2y?
I believe it should be solved like this:
30 -(-2/5)^2 x 5/8
which gives and answer of: 299/10
Am I evaluating this correctly?
Thank you!
Click here to see answer by greenestamps(13203)  |
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