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Post New Question
All Questions
+0
234922 Questions
+1
453
1
Algebra
Expand the product 2r(4r - 8 + 3).
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Guest
Apr 3, 2021
+1
638
7
+132
please help!
Let O be the center and let F be one of the foci of the ellipse 25x^2 +16 y^2 = 400. A second ellipse, lying inside and tangent to the first ellipse, has its foci at O and F. What is the length of the minor axis of this second ellipse?
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macar0ni
Apr 3, 2021
+1
474
1
algebra
At Annville Junior High School, 30% of the students in the Math Club are in the Science Club, and 60% of the students in the Science Club are in the Math Club. There are 15 students in the Science Club. How many students are in the Math Club?
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Guest
Apr 3, 2021
+1
323
3
plz help! very urgent
Find the perimeter of the trapezoid below.
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Guest
Apr 3, 2021
+1
362
1
algebra
The scale on a map of Roswell, New Mexico is 1 inch : 0.51 miles. If two buildings in Roswell are 2.8 miles apart in real life, then to the nearest tenth of inch, how far apart are they on the map?
Enter your answer as a decimal rounded to
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Guest
Apr 3, 2021
+1
260
0
ratios
In a pet shop, there are 3 hamsters for every 2 guinea pigs, and there are 2 giant cloud rats for every 8 guinea pigs. If N is the total number of hamsters, guinea pigs, and giant cloud rats, and N > 0, then what
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Guest
Apr 3, 2021
+1
384
1
algebra
Suppose the ratio of Lev's age to Mina's age is 1 : 2 and the ratio of Mina's age to Naomi's age is 3 : 4.
If the sum of all three ages is between 10 and 20, then how old is Mina?
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Guest
Apr 3, 2021
+1
292
0
Compute the point on the line help
Compute the point on the line (1 2 -1) + t (1 -2 2) closest to the point p = (-1 0 1)
Guest
Apr 3, 2021
+1
378
1
stats
For the data whose frequency histogram is shown, by how many days is the mean number of days missed per student greater than the mode number of days missed per student for the 15 students? Express your answer as a common fraction.
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Guest
Apr 3, 2021
+1
352
1
counting
How many multiples of 3 are between 62 and 275?
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Guest
Apr 3, 2021
+1
793
1
What is the probability that a randomly selected divisor of 720 is a multiple of 4? Express your answer as a common fraction.
What is the probability that a randomly selected divisor of 720 is a multiple of 4? Express your answer as a common fraction.
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Guest
Apr 3, 2021
+1
419
1
coordinates
A triangle has vertices A(−3, 3) , B(−1, 3) , and C(−1, −1). Where is the circumcenter of triangle ABC?
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Guest
Apr 3, 2021
+1
587
1
Points A,B, and C are on a sphere whose radius is 13. If AB=BC=10, what is the longest possible value of AC?
Points A,B, and C are on a sphere whose radius is 13. If AB=BC=10, what is the longest possible value of AC?
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Guest
Apr 3, 2021
+1
291
0
Challenging Problem
The 264th number with digits that increase from left to right is 6789 (notice that digits cannot repeat).
What is the 256th number with digits that increase from left to right?
Guest
Apr 3, 2021
+1
358
1
HELP ASAP
A stick has a length of $5$ units. The stick is then broken at two points, chosen at random. What is the probability that all three resulting pieces are shorter than $2$ units?
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Guest
Apr 3, 2021
+1
393
4
+487
Probability with Combinations
We flip a fair coin 10 times. What is the probability that we get heads in at least 6 of the 10 flips?
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RiemannIntegralzzz
Apr 3, 2021
+1
241
0
counting
On a rainy day, every kid at Margo's school brings a raincoat, an umbrella, or both. 8% of the kids bring both. The total number of kids with umbrellas is half the total number of kids with raincoats. What percent of the kids bring only an umbrella?
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Guest
Apr 3, 2021
+1
308
0
algebra
Ellen baked 2 dozen cupcakes of which half contained chocolate, two-thirds contained raisins, one-fourth contained chocolate chips, and one-twlefth contained nuts. What is the largest possible number of cupcakes that had none of these ingredients?
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Guest
Apr 3, 2021
+1
301
1
HELP ASAP!!
A point in space $(x,y,z)$ is randomly selected so that $-1\le x \le 1$,$-1\le y \le 1$,$-1\le z \le 1$. What is the probability that $x^2+y^2+z^2\le 1$?
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Guest
Apr 3, 2021
+1
399
3
+487
Probability with Combinations
The Grammar club has 20 members: 10 boys and 10 girls. A 4-person committee is chosen at random. What is the probability that the committee has at least 1 boy and at least 1 girl?
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RiemannIntegralzzz
Apr 3, 2021
+1
410
1
algebra
Theo left Phoenix traveling 55 mph. Two hours later, Dennis left Phoenix following Theo and he was speeding along at 75 MPH. How many hours will it take Dennis to catch up with Theo?
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Guest
Apr 3, 2021
+1
290
0
couting
At Beaumont High School, there are 12 players on the baseball team. All 12 players are taking at least one of biology or chemistry. If 9 players are taking biology and 2 players are taking both sciences, how many players are taking chemistry?
Guest
Apr 3, 2021
+1
265
0
stats
Juan organizes the stamps in his collection by country and by the decade in which they were issued. The prices he paid for them at a stamp shop were: Brazil and France, 6 cents each, Peru 4 cents each, and Spain 6 cents each. (Brazil and Peru are South
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Guest
Apr 3, 2021
+1
544
1
+132
Algebra 2.
The polynomial ax^4 + bx^3 + 32x^2 - 16x + 6 has a factor of 3x^2 - 2x + 1. Find the ordered pair (a,b).
Thanks!
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macar0ni
Apr 3, 2021
+1
386
1
please help
Complete this sequence 60, _, _, 42, 36.
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Guest
Apr 3, 2021
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