I need to find the numbers for each letter in "THINK + RETHINK = REFLECT". They gave me that "I" stands for the number "1". Since the "RE" is the same on the second number and the answer, I really only have to have the numbers for "THINK + THINK = FLECT&q...

- on Mon Dec 08, 2008 5:41 pm
- Forum: Arithmetic
- Topic: THINK + RETHINK = REFLECT (each letter stands for a number)
- Replies:
**2** - Views:
**4294**

I know some about powers and about solving by factoring. One of my "challenge" problems is to solve 2^(2x) - 7(2^x) - 8 = 0, and the hint in the book says "Let y = 2^x". I think this gives me y^2 - 7y - 8 = 0. Is that right? Because then I'm pretty sure I can finish this. Thanks.

- on Mon Dec 08, 2008 5:43 pm
- Forum: Beginning Algebra
- Topic: Solve 2^(2x) - 7(2^x) - 8 = 0 (Hint: Let y = 2^x)
- Replies:
**1** - Views:
**3497**

I don't have my book, just my homework. I want to check if I'm doing this right: Juliet was looking at Romeo from her balcony one evening. Romeo was standing at a distance of 10 m away from the foot of the house. When Juliet looked at Romeo's head, the angle of depression was 40 degrees. When she lo...

- on Tue Dec 09, 2008 9:49 pm
- Forum: Trigonometry
- Topic: angle of depression and how tall is romeo
- Replies:
**1** - Views:
**4104**

I have to find the value for (x - a)(x - b)(x - c) ... (x - z), but they didn't give me any numbers for a, b, c, ..., z. How should I start this?

- on Wed Dec 10, 2008 6:25 pm
- Forum: Discrete Math
- Topic: find value of (x - a)(x - b)(x - c) ... (x - z)
- Replies:
**2** - Views:
**4798**

How did I not see that?

- on Wed Dec 10, 2008 7:31 pm
- Forum: Discrete Math
- Topic: find value of (x - a)(x - b)(x - c) ... (x - z)
- Replies:
**2** - Views:
**4798**

A right circular, conical vessel of altitude 21 cm and base radius 11 cm is kept with its vertex downwards. If 2 litres of water is poured into it, how high above the vertex will the level of the water be? I think I need to convert the 2 L to 2000 cc's, and use similar similar triangles to find the...

- on Fri Dec 12, 2008 5:29 pm
- Forum: Geometry
- Topic: height of 2 L of water poured into upside-down cone
- Replies:
**1** - Views:
**3105**

A carpenter can make a cabinet in 30 hours. If he works for 21 hours at the normal rate of pay and 9 hours at the overtime rate, he will be paid $69. But if he works for 27 hours at the normal rate and 3 hours at the overtime rate, his earnings will be $63. Find his normal and overtime rates of pay...

- on Sun Dec 14, 2008 12:43 am
- Forum: Pre-Algebra
- Topic: find normal and overtime rates of pay for carpenter
- Replies:
**3** - Views:
**4647**

i've been doing this stuff for a few grades now, and sometimes its easier to do it the way i learned back before i started doing variables. Thank you for showing how to do it the algebra way!

- on Wed Dec 17, 2008 3:50 pm
- Forum: Pre-Algebra
- Topic: find normal and overtime rates of pay for carpenter
- Replies:
**3** - Views:
**4647**

If 12 men can dig 35 holes in 14 days, (a) how many men are needed to dig 35 holes in 8 days? (b) How many days would it take 12 men to dig 30 holes? Twelve men working 14 days is (12)(14) = 168 man-days. a: If you have 8 days and need 168 man-days, then you need (168)/(8) = 21 men. b: Thirty-five ...

- on Tue Dec 30, 2008 1:59 pm
- Forum: Pre-Algebra
- Topic: If 12 men can dig 35 holes in 14 days, how many needed to...
- Replies:
**6** - Views:
**6192**

simba wrote: Where did you learn that?? that is one of those brain teasers

I'm homeschooled and I'm taking Singapore Math.

- on Mon Jan 12, 2009 11:38 pm
- Forum: Pre-Algebra
- Topic: If 12 men can dig 35 holes in 14 days, how many needed to...
- Replies:
**6** - Views:
**6192**