Mathematics - 21 December 2007

Helen had to read 148 pages of her science textbook in the 4 days remaining before an exam. If she reads the same number of pages each day, how many pages will she need to read each day?

2007-12-21 08:39:04 · 9 answers · asked by yummyummy 1

I have this question...

http://ce.byu.edu/courses/hs/999065041006/secure/imgs/Math%2041/4sb21a.gif

Can someone help me solve it? Thanks!

2007-12-21 08:33:17 · 5 answers · asked by Starburst 2

Referring to log base 10

2007-12-21 08:30:18 · 6 answers · asked by Vi A 1

But too large to write even with scientific notation.

2007-12-21 07:59:57 · 5 answers · asked by Anonymous

1, -1, +3
+1, -2, +7
+1, +2, +7
-1, -2, +7
-1, -2, +3

2007-12-21 07:52:15 · 3 answers · asked by Poeteress 1

A 45-45-90 degree triangle with legs of length 1 unit. Call this trianlge T1.

What is the name of the process that allows you to calculate the length of the hypotenuse of this triangle?

Calculate the exact value lenght of the hypotenuse of the trianlge.

What kind of triangle is this?

2007-12-21 07:51:42 · 9 answers · asked by cher-roll 2

2007-12-21 07:08:38 · 2 answers · asked by amanda R 1

2007-12-21 07:02:10 · 6 answers · asked by luvpurple 1

2007-12-21 06:57:54 · 17 answers · asked by Anonymous

2007-12-21 06:47:28 · 3 answers · asked by Kevin J 1

6. Draw a graph of a direct variation. Go to drawing tools and click on it. (Note: Your drawing tool icon may be different if not working in Microsoft Word.) This should give you a tool bar at the bottom of your screen. Choose AutoShapes, then Lines, then the straight line with two arrows on each end. Use it to draw on the graph shown below.







7. In a certain variation, z varies jointly as x and y, and inversely as w, and
z = 2 when x = 3, y = 6 and w = 10. Find z when x = 2, y = 3 and w = 5.






8. The amount of material needed to cover a ball varies directly with the square of the radius. It takes about 221.63 cm2 of material to cover a ball with a radius of 4.2 cm. What is the radius of a ball that needs 352.92 cm2 of material to cover it?






9. Explain in words how you can tell if a table of values (t-table) represents a direct variation.

2007-12-21 06:32:13 · 2 answers · asked by Darling Anna Addiction 2

A 30 degrees-60degrees-90degrees triangle that has one leg of lenght 1 and the hypotenuse of lenth 2 units. Call this triangle T1. (note that the answer that you get from the calculator on this problem is not the exact answer but is an approximation of the answer. Do not use your calculator answer but find the answer algebraically!)

What is the name of the process that allows you to calculate the lenght of the other leg of this triangle?

What is the formula?

Calculate the exact calue length of the second leg (x)

Note-1 is on the left side of the triangle 90 degrees. 2 is on the right side. (x) is at the bottom.

2007-12-21 06:26:20 · 12 answers · asked by cher-roll 2

2007-12-21 06:21:11 · 6 answers · asked by rubbingbirds 2

1. the annual rate of deprecation, r, on a car that is purchased for P dollars and is worth W dollars t years later can be found from:
log (1-r) = 1/t log w/p

find the annual rate of depreciation on a car that is purchased for $14650 and sold 3 years later for $9500

answer: 13.4 %

2. the population of a city can be estimated by the equation
p= 108000e^0.05t
where t is the number of years fmor the present time, how many yeras will it take the population to reach 324,000?
answer: 22.0 years


i just dont understand how to do it! please help! thank you!

2007-12-21 06:06:04 · 2 answers · asked by Nana Callie loves to sing 4

Given part of an equation of a parabola in vertex form as y = a(x - 8)2 - 2. If this graph passes through the point (4, 6), what is the value of ‘c’ value when the equation is written in standard form?

2007-12-21 06:00:26 · 3 answers · asked by Shot Caller 2

1. the current of a river is 5 miles per hour. a boat travels between two points on the river. if it takes 2 hours to travel in one direction and 5/2 hours to travel in the other direction, what i the speed of the boat in still water?
answer: 45 miles per hour

2. rationalize the denominator
44x^4y / 16z^3
that whole fraction is under a square root sign
answer: x^2 (/11yz) / 2z^2

the / before the 11yz is a square root sign

3. solve for the variable
(w-4)= /(7w+2)
the 7w+2 is under a square root sign
answer: w=14
i dont understand why the answer isnt -1 also?

thank you!!!

2007-12-21 05:54:33 · 6 answers · asked by Nana Callie loves to sing 4

sorry if this question seems stupid. i can label the hypotenuse because its always the longest side and its diagonal. i was told that you can find the opposite because it's 'opposite' the right angle on the triangle, but i can interperate both sides to be 'opposite' to the right angle. so how do i tell the difference between the opposite and the adjacent side? thanks

2007-12-21 05:50:36 · 22 answers · asked by Anonymous

√k + 5 = 4

a. k = -1
b. k = 1
c. k = 81
d. no solution

2007-12-21 05:42:12 · 8 answers · asked by . 1

2007-12-21 05:39:06 · 9 answers · asked by Anonymous

2007-12-21 05:38:08 · 7 answers · asked by Anonymous

2007-12-21 05:37:18 · 5 answers · asked by Anonymous

2007-12-21 05:36:07 · 9 answers · asked by Anonymous

√7x - 60= √x

a. x = 12
b. x = -5, 12
c. x = 10
d. no solution

2007-12-21 05:36:06 · 3 answers · asked by mommawe'regoingtohell 1

2007-12-21 05:34:59 · 9 answers · asked by Anonymous

I have this problem in algebra that I have been working on all day now. please help. solve. -3(x-3)+8(x-3)=x-9 thank you.

2007-12-21 05:31:36 · 5 answers · asked by lucy704 1

Four brands of soap are available in a local store.

Brand Ounces Total Price Unit Price
Squeaky Clean 5.5 $0.36
Smell Fresh 7.5 0.41
Feel Nice 4.5 0.31
Look Bright 6.5 0.44

Compute the unit price and decide which brand is the best buy.

2007-12-21 05:25:53 · 4 answers · asked by Anonymous

Which of these are irrational and rational?

1. 0.7
2.3.3451 (there is a straight line over the 451)
3. 4 and 5/8s

2007-12-21 05:03:55 · 7 answers · asked by Anonymous

How would I design a 2-column proof to verify this trigonometric identity?
(I can only use material up to pythagorean identities to solve this...such as sin2x+cos2x=1)

tan(x)+tan(y)
----------------------
1-[tan(x)*tan(y)]


=

cot(x) +cot(y)
-------------------
[cot(x)cot(y)] -1



(It should be in two columns on the same line but this thing deletes all the spaces and makes it look unreadable.)

2007-12-21 04:57:41 · 4 answers · asked by I Need Help 4

i cant use my calculator to work out minus powers. everytime i type the sum in it gives me the same sum as the answer, when i want a number. for example i am trying to work out 36.9*10 to the power of -6. when i type that in my calculator using the (-) button to make the power minus my sum just comes up as the answer. its a casio scientific calculator. help anyone? do i need to change the mode or something?

2007-12-21 04:37:53 · 8 answers · asked by Anonymous

Hi,

I need help with these problems please!

Here are the figures:

http://tinypic.com/fullsize.php?pic=72j3kue&s=1&capwidth=false

1. Figure 1 is a(n) ______ triangle

a. scalene
b. Isosceles
c. equilateral

2. Figure 2 is a(n) _____ triangle

a. scalene
b. Isosceles
c. equilateral

2007-12-21 04:22:19 · 5 answers · asked by ~♥♥♥~ 3