10 second questions

Jai Ganesh · 2011-10-10 01:26:06

Hi anonimnystefy and bobbym,

The solutions of anonimnystefy are both correct. Brilliant!

The solution #3305 is correct. Good work, bobbym!

(The solution #3304 :

)

#3306. A solid right circular cylinder has a base radius of 12 cm and height of 16 cm. It is melted and made into 8 spherical balls of equal size. Calculate the radius of each of the spherical balls.

bobbym · 2011-10-10 02:13:59

Hi ganesh;

Jai Ganesh · 2011-10-10 23:40:38

Hi bobbym,

The solution #3306 is correct. Well done!

#3307. The mid-point of the line segment PQ is (5,1). If P is (8,4), find the point Q.

#3308. Find the equation of the straight line whose slope is 4 and passes through the point (5,7).

bobbym · 2011-10-11 01:16:50

Hi;

kireb · 2011-10-11 02:35:26

1 kilometer is how many millimeter?

bobbym · 2011-10-11 03:13:21

Hi kireb;

Please start a new thread in "Help me" for such questions.

Jai Ganesh · 2011-10-12 00:11:26

Hi bobbym,

The solutions #3307 and #3308 are perfect. Good work!

#3309. The angle of elevation of the top of a tower from a place and distance of 60 meter from its foot on a horizontal plane is found to be 45[sup]o[/sup]. Find the height of the tower.

#3310. The standard deviation of 10 values is 4. If each value is increased by 3, find the standard deviation of the net set of values.

bobbym · 2011-10-12 00:17:37

Hi ganesh;

Jai Ganesh · 2011-10-13 00:01:45

Hi bobbym,

The solutions #3309 and #3310 are perfect. Good work!

#3311. Find the centroid of the triangle whose vertices are given by (2,3), (5,4), and (2,2).

#3312. Find the point of intersection of the lines x = -4 and y = 0.

bobbym · 2011-10-13 00:06:00

Hi ganesh;

Jai Ganesh · 2011-10-14 21:32:45

Hi bobbym,

The solutions #3311 and #3312 are correct. Well done!

#3313. Which term of the sequence 12, 18, 24, ... is 156?

#3314. Find the sum to infinity of the squeunce 64, 32, 16, 8. ....

bobbym · 2011-10-15 00:11:15

Hi;

Jai Ganesh · 2011-10-15 22:35:35

Hi bobbym,

The solutions #3313 and #3314 are perfect. Neat job!

#3315. Find the area of the quadrilateral whose vertices are (5,8), (6,3), (3,1), and (2,6).

#3316. Find the equation of the straight line perpendicular to the straight line given by the equation 4x - 3y + 2 = 0 and passes through (-2,3).

bobbym · 2011-10-16 00:59:54

Hi ganesh;

Jai Ganesh · 2011-10-16 22:10:30

Hi bobbym,

The solution #3315 is perfect. Excellent!

The solution #3316 I get

#3317. The variance of 5 values is 9. If each value is doubled, then find the standard deviation of the new values.

#3318. An integer is chosen from 10 to 30. Find the probability of that being a prime number.

bobbym · 2011-10-16 22:50:36

Hi;

Jai Ganesh · 2011-10-17 22:31:04

Hi bobbym,

The solution #3317 is correct. Good work!

The

#3319. A capsule is in the form of a cylinder with hemispherical ends. The total height of the capsule is 19 cm and the diameter of the cylinder is 7 cm. Find the total surface area of the capsule.

#3320. For lunch, food is kept in 3 cylindrical vessels of radius 70 cm and height 56 cm. How many students can be served if the food is served with a hemispherical bowl of radius 14 cm?

bobbym · 2011-10-17 23:03:20

Hi ganesh;

Yes, sorry! Counted the number up wrong. You are correct.

Jai Ganesh · 2011-10-17 23:32:43

Hi bobbym,

The solution #3319 (133 pi sq.cm) is perfect. Good work!

However, the solution

.

#3321. Factorize : 2x[sup]3[/sup] + 3x[sup]2[/sup] - 2x - 3.

bobbym · 2011-10-17 23:40:45

Hi ganesh;

That is funny about #3320, now I am getting 450 as the answer!

Jai Ganesh · 2011-10-19 00:41:03

Hi bobbym,

The

The solution #3321 is perfect. Excellent!

#3322. Show that the lines x + y - 3 = 0, x + 2y - 5 = 0, and x + 3y - 7 = 0 are concurrent and also find the point of concurrency.

#3323. Find the area of an isosceles triangle with base 20 cm and vertical angle 60[sup]o[/sup].

bobbym · 2011-10-19 01:20:26

Hi ganesh;

Jai Ganesh · 2011-10-20 00:11:52

Hi bobbym,

The solutions #3320, #3322, and #3323 are correct. Excellent!

#3324. A publisher printed 2000 copies of a book at a cost of $6,000. He distributed 100 copies to institutions as free samples and sold the remaining at the rate of $4 per copy. What is his gain or loss percent?

#3325. 7% of the selling price of an article is equal to 8% of its cost price; 9% of the selling price exceeds 10% of its cost price by $2. Find the amount of profit or loss.

bobbym · 2011-10-20 04:20:58

Hi;

Jai Ganesh · 2011-10-20 22:19:03

Hi bobbym,

The solutions #3324 and #3325 are correct. Brilliant work!

#3326. The average weight of 7 persons decreases by 2 kg if a person with weight 73 kg is replaced by another person. Find the weight of the new person.

#3327. The average of 200 items was 50. Later on, it was discovered that two items were misread as 92 and 8 instead of 192 and 88. Find the correct average.

Math Is Fun Forum

#3226 2011-10-10 01:26:06

Re: 10 second questions

#3227 2011-10-10 02:13:59

Re: 10 second questions

#3228 2011-10-10 23:40:38

Re: 10 second questions

#3229 2011-10-11 01:16:50

Re: 10 second questions

#3230 2011-10-11 02:35:26

Re: 10 second questions

#3231 2011-10-11 03:13:21

Re: 10 second questions

#3232 2011-10-12 00:11:26

Re: 10 second questions

#3233 2011-10-12 00:17:37

Re: 10 second questions

#3234 2011-10-13 00:01:45

Re: 10 second questions

#3235 2011-10-13 00:06:00

Re: 10 second questions

#3236 2011-10-14 21:32:45

Re: 10 second questions

#3237 2011-10-15 00:11:15

Re: 10 second questions

#3238 2011-10-15 22:35:35

Re: 10 second questions

#3239 2011-10-16 00:59:54

Re: 10 second questions

#3240 2011-10-16 22:10:30

Re: 10 second questions

#3241 2011-10-16 22:50:36

Re: 10 second questions

#3242 2011-10-17 22:31:04

Re: 10 second questions

#3243 2011-10-17 23:03:20

Re: 10 second questions

#3244 2011-10-17 23:32:43

Re: 10 second questions

#3245 2011-10-17 23:40:45

Re: 10 second questions

#3246 2011-10-19 00:41:03

Re: 10 second questions

#3247 2011-10-19 01:20:26

Re: 10 second questions

#3248 2011-10-20 00:11:52

Re: 10 second questions

#3249 2011-10-20 04:20:58

Re: 10 second questions

#3250 2011-10-20 22:19:03

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