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Post New Question
All Questions
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232716 Questions
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1502
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Insert Title Here
1. In a certain lottery, three white balls are drawn (at random) from ten balls numbered from 1 to 10, and one red SuperBall is drawn (at random) from ten balls numbered from 11 to 20. When you buy a ticket, you select three numbers from
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somehelpplease
Feb 29, 2020
-2
876
2
+194
Help would be apprecaited (I can't spell)
1. A bag contains five white balls and four black balls. Your goal is to draw two black balls.
a)You draw two balls at random. What is the probability that they are both black?
b)You draw two balls at random. Once you have drawn
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somehelpplease
Feb 29, 2020
-3
611
3
+194
Math Help Please
1. Three cards are chosen at random from a standard deck of cards, without replacement. What is the probability that the first card is spades, the second card is hearts, and the third card is also spades?
2. Wu rolls two fair, six-sided
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somehelpplease
Feb 29, 2020
0
1460
1
confused
An IRS auditor randomly selects 3 tax returns from 61 tax returns of which 9 contain errors. What is the probability that she selects all those containing errors? This is unusual probability?
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Guest
Feb 29, 2020
0
867
2
+312
NUMBER THEORY
When 11^4 is written out in base 10, the sum of its digits is 16 = 2^4. What is the largest base b such that the base-b digits of 11^4 do not add up to 2^4? (Note: here, 11^4 in base b means that the base-b number 11 is
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mathleteig
Feb 29, 2020
0
737
2
help
What is the inradius of a triangle with side lengths 9, 40, and 41?
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Guest
Feb 29, 2020
0
616
1
Help with geo
A sphere of radius 1 and a sphere of radius 2 are inscribed in a right circular cone, as shown below. Find the volume of the cone.
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Guest
Feb 29, 2020
0
490
1
Trig
sin angle RPQ = 7/25. Compute sin angle RPS. Express your answer as a fraction.
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Guest
Feb 29, 2020
0
6567
2
You are dealt one card from a 52-card deck. Find the probability that you are dealt a king or a black card.
You are dealt one card from a 52-card deck. Find the probability that you are dealt a king or a black card.
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Guest
Feb 29, 2020
0
897
1
help
In general, find the number of k-tuples of nonnegative integers such that
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Guest
Feb 29, 2020
0
576
1
+288
Function's Range
Find the range of the function as varies over all real numbers.
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madyl
Feb 29, 2020
0
666
3
help
George can mow his lawn in 3 hours, Al can mow his lawn in 5 hours. How long will it take both of them working together?
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Guest
Feb 29, 2020
0
629
2
Help
An oil spill spreads 25 square meters every 1/6 hour. How much area does the oil spill cover after 2 hours?
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Guest
Feb 29, 2020
0
779
1
I need help on this!!!
Let line l_1 be the graph of 3x + 4y = -14. Line l_2 is perpendicular to line l_1 and passes through the point (-5,7). If line l_2 is the graph of the equation y=mx +b, then find m+b.
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Guest
Feb 29, 2020
0
576
1
+6
Geometry!
△ABC has sides AB=3, BC=4, and AC=5. Angle bisectors AD, BE, and CF intersect at I. What is AI/ID?
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mnair797
Feb 29, 2020
0
1951
1
math
A bag of coins contains 2 quarters, 5 dimes, 3 nickels, and 4 pennies. If 2 coins are randomly chosen from the bag, one after the other, and not replaced, and if the total value of the chosen coins is 26 cents, what is the probability that a third coin
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Guest
Feb 29, 2020
0
444
1
can anyone help?
There are 400 houses in a city, all of which have either two rooms or four rooms. There are 135 two room houses in the city. There are 110 four-room houses that have a Television. 22% of all the houses with TVs have a cable connection. If 25% of all the
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Guest
Feb 29, 2020
0
366
1
help
Calculate the slant height of the following square based pyramid, given the information below.
Total Surface Area = 585 m2
Area of Base = 225 m2
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Guest
Feb 29, 2020
0
425
1
PLEASE HELP!!
Let line l_1 be the graph of 3x + 4y = -14. Line l_2 is perpendicular to line l_1 and passes through the point (-5,7). If line l_2 is the graph of the equation y=mx +b, then find m+b.
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Guest
Feb 29, 2020
0
496
1
help
freight train and an express train leave towns 390 km apart, traveling toward one another. The freight train travels 30 km per hour slower than the express train. They pass one another 3 hours later. What are their speeds?
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Guest
Feb 29, 2020
0
473
1
Stuck with homework!
How do you write 3x2+2.4x in the form a(x+p)2+q and state the value of a, p and q?
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Guest
Feb 29, 2020
0
584
1
please help me
Miko and Cheko each had an equal number of stamps. On Cheko's birthday, Miko gave Cheko 31 stamps. After receiving the stamps from Miko, Cheko had 3 times as many stamps as Miko. How many stamps had Cheko in the end?
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Guest
Feb 29, 2020
0
363
0
help
Ten people are to be seated at two circular tables. One table seats six people and the other seats four.
i) With these tables, how many different seating arrangements are there for the ten people?
ii) Assuming that the seating is random, what is the
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Guest
Feb 29, 2020
0
394
0
help would be appreciated. thank you so much. (hard geometry problem)
In square , and are the midpoints of and , respectively. Line segments and intersect at . Let be the midpoint of , and let be the intersection
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Guest
Feb 29, 2020
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