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Post New Question
All Questions
+0
230681 Questions
0
684
2
+8
help please
Find constants A and B such that
(x+7)/(x^2 - x - 2) = [A/(x-2)]+[B/(x+1)]
for all x such that x ≠ -1 and x ≠ 2. Give your answer as the ordered pair (A, B).
read more ..
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grnolives
Dec 26, 2019
0
1
873
3
help
What is the angle colored purple in degrees?
hectictar
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Guest
Dec 26, 2019
+7
754
0
+382
Competition Math
Let be a positive integer. If the equation has solutions in positive integers and , then must be either
(A) 14 or 15
read more ..
hellospeedmind
Dec 26, 2019
0
541
2
help
If 2a + 3b = c, a + b + c = 42, c - a = 19, find (c + 1)/(ab).
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Guest
Dec 26, 2019
0
397
1
help
Solve (1 + 3 + 5 + ... + (2n - 1))/(2 + 4 + 6 + ... + 2n) = 2017/2018.
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Guest
Dec 26, 2019
0
368
0
help
A square of side 112 is partitioned in 21 squares of different sizes. Each number (shown in the figure) denotes the side length of its square. Find the side lengths of the smallest, 2nd smallest and 3rd smallest squares.
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Guest
Dec 26, 2019
0
612
2
help
In the trapezium ABCD where AB is parallel to CD, AB is 3 units longer than CD, BC = 5, and AD is perpendicular to AB. Given that the area of the trapezium is 34, find the perimeter
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Guest
Dec 26, 2019
0
448
1
help
Find all real values of x that satisfy . Give your answer in interval notation.
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Guest
Dec 26, 2019
Dec 25, 2019
0
616
1
help
ABC has a right angle at B. AC = 60, AE = 52 and CD = 39. Find the length of DE.
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Guest
Dec 25, 2019
+1
746
2
geometry
Which is larger: the yellow area or the blue area?
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Guest
Dec 25, 2019
+1
616
1
help
If sin(x)*tan(x) = 1, find cos(x).
ElectricPavlov
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Guest
Dec 25, 2019
0
2498
1
17 times what equals 100
17 times what equals 100
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Guest
Dec 25, 2019
0
410
1
help
Compute
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Guest
Dec 25, 2019
-1
905
1
HELP PLZ
Lucy was born on Wednesday, December 1st, 2004. That Wednesday was the first day of her life. Her parents held a party for her on the th day of her life. On which day of the week was the party?
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Guest
Dec 25, 2019
0
1256
2
+24
Please help (a lot of questions) :) thank you
1. The quadratic $x^2 + 5x + c$ has roots in the form of $x = \frac{-5 \pm \sqrt{c}}{2}$. What is the value of $c$?
2. The quadratic $x^2+440x+440^2$ can be written in the form $(x+b)^2+c$, where $b$ and $c$ are constants.
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Elen8
Dec 25, 2019
0
739
1
help
Circle A and circle B are concentric. A chord of circle A that is tangent to circle B has a length that is twice the radius of circle B. What is the ratio of the area of circle A to the area circle B?
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Guest
Dec 25, 2019
0
643
1
+16
Prove that if $w,z$ are complex numbers such that $|w|=|z|=1$ and $wz\ne -1$, then $\frac{w+z}{1+wz}$ is a real number.
Prove that if are complex numbers such that and , then is a real number.
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Thecarl69
Dec 25, 2019
-1
655
3
help
If two numbers have arithmetic mean 2700 and harmonic mean 75, then find their geometric mean.
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Guest
Dec 25, 2019
0
753
1
help
Solve x(y + z) = 39, y(x + z) = 60, z(x + y) = 63.
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Guest
Dec 25, 2019
0
1018
4
help
A frog is at the bottom of the well which is 20 meters deep. Everyday the frog jumps 5 meters upwards and fall 4 meters down.On which day the frog will reach the top?
Omi67
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Guest
Dec 25, 2019
0
673
2
help
Compute arctan(1) + arctan(2) + arctan(3).
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Guest
Dec 25, 2019
0
653
1
help
Let n be a positive integer.
(a) Prove that
by counting the number of ordered triples (a,b,c) where in two different ways.
(b) Prove that
by counting the number of subsets of containing three different numbers in
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Guest
Dec 25, 2019
0
4641
1
Calc
Let f and g be differentiable functions with the following properties:
(i) g(x) > 0 for all x
(ii) f(0) = 1 If h(x) = f(x)g(x) and h'(x)=f(x)g'(x), then f(x) = ?:
A) f'(x)
B) g(x) <#> C) ex <#> D) 0 <#> E) 1 <#> My guess is E, since ii implies
read more ..
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Guest
Dec 25, 2019
0
919
1
+1486
Folded rectangle
The rectangle with the area of 12 cm2 has a specific ratio a : b. When folded in half along the longer sides, a new, smaller rectangle, has the same ratio as the original one. Find the sides a and b, and the sides of a new rectangle
read more ..
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Dragan
Dec 25, 2019
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