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Post New Question
All Questions
+0
230860 Questions
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787
2
Another question about matrices
A and B are matrices that can be multiplied together.
When does AB=BA
This is of course ignore the basic, A or B = O, AB= O, A or B = I (identical matrix), and AB = I.
read more ..
Alan
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Guest
Jul 21, 2017
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738
2
Question about matrixes
P and A are 2x2 matrices.
Is the following true?
P-1AP = APP-1
read more ..
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Guest
Jul 21, 2017
0
833
2
simplify this expression?
(the answer has to be in positive exponents)
heureka
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Guest
Jul 21, 2017
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672
0
calculate the missing dimensions of each of the following
1) a right cone has a surface area 12 m^2 and radius 1.3 m
2) the square base of a right pyramid has area 2304 cm^2 and surface area 6144 cm^2
3) a sphere has surface area 385 cm^2
Guest
Jul 21, 2017
0
550
0
0.554^3 mm^3
0.554^3 mm^3
Guest
Jul 21, 2017
0
752
1
finding length of an unknown side of a frame?
how should I solve b? i already solved a and got 1:2
the dimensions of the photo irl is 1.6in by 1.875in (the photo was on my textbook, so it
read more ..
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Guest
Jul 21, 2017
0
1532
2
The fifth term of an arithmetic sequence is 9 and the 32nd term is -84. What is the 23rd term?
The fifth term of an arithmetic sequence is 9 and the 32nd term is -84. What is the 23rd term?
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Guest
Jul 21, 2017
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1146
1
determining integral values?
determine ALL integral values of k so that each trinomial can be factored:
1) x^2 + kx - 9
read more ..
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Guest
Jul 21, 2017
0
1562
1
finding the dimensions of a cube with a hole?
a cube has a square hole all the way through it. if the volume of wood used to construct the cube is 3072 mm^3, what are the dimensions of the cube and the hole?
read more ..
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Guest
Jul 21, 2017
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1006
3
+30
what is math
what is math? joking! notreally. idek anymore
off-topic
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TheBestAquamarine
Jul 21, 2017
Jul 20, 2017
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2313
2
How many terms of the arithmetic sequence 88, 85, 82, . . . appear before the number -17 appears?
How many terms of the arithmetic sequence 88, 85, 82, . . . appear before the number -17 appears?
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Guest
Jul 20, 2017
0
832
2
Help Me Pls!!!
Compute
heureka
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Guest
Jul 20, 2017
0
1032
4
My exponent of 10
Hello, I don't understand when I calculate .006708 to the 180, answer is zero.
hectictar
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Guest
Jul 20, 2017
0
702
1
how do you no awnser:
I have 222x222 and I gave my firend 298 how do I have left anwser: a.500 b.900 c.300 d.48,986
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Guest
Jul 20, 2017
0
1162
2
+98
MATHCOUNTS Problem
There is at least one two-digit number such that when it is added to the two-digit number having the same digits in reverse order, the sum is a perfect square. Find the sum of all such two-digit numbers.
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benjamingu22
Jul 20, 2017
0
1176
4
creating a rational exponent equation??
household smoke detectors contain 200 ug of a radioactive element that has a half-life of 432 years. to the nearest 10 ug, how much of this element will remain in a smoke detector after 20 years?
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Guest
Jul 20, 2017
+1
3726
1
+77
triangles
In $\triangle ABC$, we have $AB = AC = 13$ and $BC = 10$. Let $M$ be the midpoint of $\overline{AB}$ and $N$ be on $\overline{BC}$ such that $\overline{AN}$ is an altitude of $\triangle ABC$. If $\overline{AN}$ and $\overline{CM}$ intersect at $X$, then
read more ..
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eileenthecoolbean
Jul 20, 2017
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646
1
Prime or composite?
How to determine if the following number is prime or composite? [7^79*11^61 *3^103] + 2
Thank you.
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Guest
Jul 20, 2017
0
747
2
Series expansion
Please expand the following at x = 0: sqrt(1 + x)^ -1. Thank you for help.
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Guest
Jul 20, 2017
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1053
4
helpppp!!! 6q^2 - 7qr - 24r^2 ?????
helpppp!!! 6q^2 - 7qr - 24r^2
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Guest
Jul 20, 2017
0
834
2
hard maths trick
can you solve it??? a+b= a= 1/2+1/4+1/6+1/8+1/10+1/12.....+1/120 b= 1/1+1/2+1/3+1/4+1/6....=1/60:2 can u find the trick????
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Guest
Jul 20, 2017
0
688
1
Compound Value of an Annuity
you need $66132 at the end of twenty years. yo know that the best you can do is to make equal payments into a bank account on which you can earn 5% of interest annually. what amount must you plan to pay annually to achieve your objective?
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Guest
Jul 20, 2017
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