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help
How many integers between 200 and 300 have the sum of their digits equal to 15?
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SmartMathMan
24
mins ago
+1
8
4
+367
Help!
The sum of all the digits used to write the whole numbers 10 through 13 is 1+0+1+1+1+2+1+3 = 10. What is the sum of all the digits used to write the whole numbers 1 through 110, inclusive?
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SmartMathMan
1 hour ago
0
8
0
PLS HELP NOW PLS DUE TMROW
1) Find the area of a regular 12-gon inscribed in a unit circle.
2) A regular hexagon has side length 6. If the perimeter and area of the hexagon are p and A, respectively, what is the value of (p^4)/(a^2)?
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Guest
1 hour ago
0
9
2
Help with 2 questions
1. The solutions of $x(x-3)=1$ may be expressed in the form $\frac{a+\sqrt{b}}{c}$ and $\frac{a-\sqrt{b}}{c}$, where $a$, $b$, and $c$ are prime numbers. Find $abc$.
2. The quadratic $4x^2+2x-1$ can be written in the form
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Guest
2 hours ago
0
11
1
18+5x^2=20x
There are two distinct solutions $x$ to the equation $18+5x^2=20x$. If each solution is rounded to the nearest integer, and then these two integers are multiplied together, what is the result?
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Guest
2 hours ago
0
10
1
Help
If we express $3x^2 + x - 4$ in the form $a(x - h)^2 + k$, then what is $k$?
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Guest
3 hours ago
0
13
7
+414
Let x and y be real numbers whose absolute values are different and that satisfy
Let x and y be real numbers whose absolute values are different and that satisfy
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AnonymousConfusedGuy
4 hours ago
0
10
2
+196
School
Sam left his school at 3:05. He walked at a speed of 3.2 mph. 15 minutes later, Al started running after him, and he caught up with Sam 10 minutes later. What was Al’s speed?
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joebob
4 hours ago
0
11
1
Taylor Series for Sine
It is a well-known fact that the sine of x can be calculated very rapidly and accurately using the famous Taylor series: Sin(x) =x - x^3/3! + x^5/5! - x^7/7! + x^9/9! - x^11/11!.....etc. But x must be in radians. But suppose x was in degrees, what would
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Guest
5 hours ago
0
11
2
Help
Find all values of $c$ such that $\dfrac{c}{c-5} = \dfrac{4}{c-4}$. If you find more than one solution, then list the solutions you find separated by commas.
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Guest
5 hours ago
0
10
1
Help asap
Find all real values of $x$ that satisfy the equation $(x^2 - 82)^2 = 324$. If you find more than one, then list your values in increasing order, separated by commas.
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Guest
5 hours ago
0
15
1
+64
Catalan sequence
In a 6 by 6 grid, how many pathways can be drawn from S to F, S is the top left corner and F is the bottom right corner (always moving to the right or down) that cross the main diagonal at least once? (You can use the Catalan sequence for this question,
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jonathanxu999
6 hours ago
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