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Post New Question
All Questions
+0
234777 Questions
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239
1
Complex Numbers
Evaluate (-5+2i)/(1-7i). Write your answer ini the form a+bi.
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Guest
Aug 17, 2021
0
251
0
The distribution of the r.v. Z= X1+X2+: : : + X5 is
The distribution of the r.v. Z= X1+X2+: : : + X5 is
Guest
Aug 17, 2021
0
390
1
Ratios
The ratio of new age tunes to classical tunes on Raven's mp3 player is 3:1. If Raven has 3 classical tunes, how many new age tunes does she have?
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Guest
Aug 17, 2021
-1
594
5
the integers between -2 and 3
the integers between -2 and 3
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Guest
Aug 17, 2021
-9
876
3
+118653
Since I am on lockdown,
Since I am on lockdown,
I have time to look at some old questions that had been put aside for a rainy day.
Here is one.
Maybe someone other than me might be interested ....
read more ..
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Melody
Aug 17, 2021
0
363
1
need online calculator with Sigma/Summation function within an equation
I need a calculator that allows me to insert summation/ sigma into my equation but can't find one online and can't find that function here
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Guest
Aug 17, 2021
0
334
1
Algebra
Solve (2x + 4)/(x^2 + 4x - 5) = (2 - x)/(x + 5).
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Guest
Aug 17, 2021
0
247
1
Geometry
Points A(0,0), B(9,6) and C(6,12) are vertices of triangle ABC. Point D is on segment AB such that 3(AD) = DB, point E is on segment BC such that 3(BE) = EC and point F is on segment CA such that 4(CF) = FA.
read more ..
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Guest
Aug 17, 2021
0
367
2
System
Find the ordered triplet (x,y,z) for the following system of equations:
x + 3y + 2z = 1
-3x + y + 5z = 10
-2x + 3y + z = 7
read more ..
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Guest
Aug 17, 2021
0
241
1
Algebra
Let a and b be the roots of the equation x^2 - mx + 2 = 8x + 1/m. Suppose that a + 1/b and b + 1/a are the roots of the equation x^2-px+q=0. Compute p/q.
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Guest
Aug 17, 2021
0
246
1
Help algebra
One gallon of paint covers 400 square feet. What is the least amount of paint needed to paint the walls of a room in the shape of a rectangular prism with a length of 20 feet, a width of 16 feet, and a height of 10 feet? Write your answer as a decimal.
read more ..
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Guest
Aug 17, 2021
0
513
2
Need help please
Let $a_1,$ $a_2,$ $\dots,$ $a_n$ be real numbers such that
\[a_1^2+2a_2^2+\cdots+na_n^2 = 1.\]Find the maximum value of $(a_1+2a_2+\cdots+na_n)^2.$
Thanks,
read more ..
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Guest
Aug 17, 2021
0
259
1
Graphing
The graph y = f(x) of is shown in red below. Find f(2). (Assume grid lines are spaced 1 unit apart.)
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Guest
Aug 17, 2021
0
195
0
Parabola
The graph of y = f(x) is a parabola whose vertex is at (1,-2). The graph of y = f(x + 8) is also a parabola. Where is the vertex of the graph of y = f(x)? Write your answer as an ordered pair.
Guest
Aug 17, 2021
+1
393
1
+700
Polynomials
I'm taking AP calc AB for this semester and I UH kinda havent done anything math over a year so i am struggling a bit....trying to cram everything within 2 days.....anyways
does anyone remember how to do this?
given f(x) = x^2+6x+7
read more ..
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Nirvana
Aug 17, 2021
0
267
2
Geometry
As shown in the diagram, PQ is the median of trapezoid ABCD where AB = 25 inches and CD = 38 inches. Find XY in inches.
read more ..
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Guest
Aug 17, 2021
0
239
1
help quadratic
A creature on the moon throws a rock off a cliff. The height of the rock above the surface of the moon, in meters, t seconds after it is thrown is given by h(t) = −t^2+ 18t + 10. When does the rock hit the surface of the moon?
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Guest
Aug 17, 2021
0
337
1
need help
What number goes in the box so that the quadratic is the square of a binomial? 9x^2 + 6x + ___ + x^2 + 4x.
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Guest
Aug 17, 2021
Aug 16, 2021
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250
1
Quadratic
What is the minimum value of 5x^2 - 20x + 1357 + 5x^2 - 10x - 1328?
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Guest
Aug 16, 2021
0
445
2
Help please
A positive number is called n-primable if it is divisible by and each of its digits is a one-digit prime number. How many 3-primable positive integers are there that are less than 1000?
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Guest
Aug 16, 2021
0
246
1
Geometry
Volume of a box is 96 cubic inches. The length is 8 inches more than the height. The width is 2 inches less than the height. Find the dimensions of the box
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Guest
Aug 16, 2021
0
357
1
Sequences
If the first term of an arithmetic sequence equals the third minus the second, and the fourth term is 18, what is the first term?
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Guest
Aug 16, 2021
0
224
0
Algebra
If a + b + 4 and a^3 + b^3 = 44, then a, b are the roots of which quadratic equation?
Guest
Aug 16, 2021
0
255
1
Polynomials
Consider the polynomials
f(x) = 1 - 12x + 3x^2 - 4x^3 + 5x^4
and
g(x) = 3 - 2x - 6x^3+ 10x^4
read more ..
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Guest
Aug 16, 2021
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