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216172 Questions
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98
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Base Numbers
What is the average of all positive integers that have four digits when written in base 3, but three digits when written in base 5? Write your answer in base 10.
Guest
Nov 26, 2021
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87
0
Probability
If I choose four cards from a standard -card deck,with replacement, what is the probability that I will end up with four cards from the same suit?
Guest
Nov 26, 2021
0
124
1
Geometry
In triangle ABC, CA=4sqrt(2), CB=4sqrt(6), and A=60 degrees. What is B in degrees?
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Guest
Nov 26, 2021
0
123
1
geometry
In the regular octagon below, find x.
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Guest
Nov 26, 2021
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139
0
Probability
The following cards are dealt to three people at random, so that everyone gets the same number of cards. What is the probability that everyone gets a red card?
read more ..
Guest
Nov 26, 2021
0
202
3
Algebra
Let x and y be real numbers such that 2(x^2 + y^2) = x + y + 8. Find the maximum value of x - y.
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Guest
Nov 26, 2021
0
131
1
Divisors
How many positive integers divide evenly into either 144 or 196 but not 72?
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Guest
Nov 26, 2021
0
136
3
easy trig i need help on
I want to know how to find sin 135˚.
i mean using a calculator you get 0.707 but i want to know how to do it without a calc.
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Guest
Nov 26, 2021
0
99
0
Counting
Of all the four-digit positive integers containing only digits from the set {2,4,6,8} what fraction of them have at least one 8?
Guest
Nov 26, 2021
0
121
1
Counting
A committee of 4 is to be chosen from a group of students. If the number of students in the group increases by 1, the number of different committees triples. How many students are in the group?
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Guest
Nov 26, 2021
0
177
2
Geometry
In concave equilateral pentagon ABCDE, angle A=angle B= 108 degrees. What is the degree measure of E?
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Guest
Nov 26, 2021
0
178
1
Combination Question
Carla selects 5 fruit-flavored candies from a bowl containing 6 apple, 5 banana and 4 cherry candies. How many combinations of candies can Carla select?
Can somebody give a full, complete solution? The other thread only had 1-step
read more ..
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Guest
Nov 26, 2021
0
168
1
Quadratic
Find the set of values of k for which this equation has two real roots.
5x^2 + 4k*x + k = 3x + 2
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Guest
Nov 26, 2021
0
158
1
Sequences
There is a sequence of numbers such that every entry except for the first entry is the arithmetic mean of its two neighboring entries. The 27th entry is 94 and the 94th entry is 46. What's the first entry?
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Guest
Nov 26, 2021
Nov 25, 2021
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179
1
Subset counting
How many subsets of the set $\{1,2,3,4, 5, 6, 7, 8, 9, 10\}$ contain the number 5, 6, and 7?
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Guest
Nov 25, 2021
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205
4
Geometry
In triangle ABC, angle C is a right angle. Point M is the midpoint of AB, point N is the midpoint of AC, and point O is the midpoint of AM. The perimeter of triangle ABC is 112 and ON = 15. What is the area of triangle ABC?
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Guest
Nov 25, 2021
0
92
0
Complex Nubmers
Let u and w be complex numbers such that:
|u| = 5, |w| = 3, |u+w| = 7
Calculate |u+2w| with proof.
Guest
Nov 25, 2021
+1
197
1
+18
HELP!! URGENT!!
Find the units digit of $16^{17} \times 17^{18} \times 18^{19}$.
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arturfetahu
Nov 25, 2021
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87
0
Parabola
The graph of y = f(x) is a parabola whose vertex is at (1,-2). The graph of y = f(x + 4) - 3 is also a parabola. Where is the vertex of the graph of y = f(x + 4) - 3?
Guest
Nov 25, 2021
0
105
0
Quadratic
For what values of j does the equation (2x+7)(x-5) = -43 + jx + 8x + 11 have exactly one real solution?
Guest
Nov 25, 2021
0
134
1
Octagon
In the regular octagon below, find x.
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Guest
Nov 25, 2021
+13
177
2
+483
help quickly
Suppose that are positive integers satisfying , and such that the product of all three numbers is twice their sum. What is the sum of all possible values of ?
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abcdefghijklmnopqrst
Nov 25, 2021
0
157
1
Probability
Wu rolls two fair, six-sided dice. You are not told what the rolls were, but you are told that the sum of the two rolls is a prime. What is the probability that the sum of the two rolls is $2$?
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Guest
Nov 25, 2021
0
97
0
Probability
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 $3$ units?
Guest
Nov 25, 2021
0
162
1
Graphing question
The graph of y = f(x) has the line x = 5 as an axis of symmetry. The graph also passes through the point (7,-8). Find another point that must lie on the graph of y = f(x).
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Guest
Nov 25, 2021
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