Math grade 1
Adding and subtracting, tens and ones, telling time, categories, nouns, verb tense, time order, and more.
Math grade 2
Placevalue models, contractions, irregular plurals, plants and animals, historical figures, and more.
Math grade 3
Multiplying and dividing, bar graphs, pronouns, possessives, weather and climate, geography, and more.
Top Questions
nguyenky123
12/10 at 08:44thanhbinh0903
29/09/2019 at 13:42thủy Mai Thị
27/09/2019 at 06:09Quoc Tran Anh Le Coodinator
10/08/2018 at 03:30Maciej carries a bookmark with this table on it to help him remember his secret four digit number. If his secret number is 8526, all he has to do is to remember the words HELP. To retrieve his number, he looks up the letters of the word HELP and finds the corresponding digits in the top row of the table. Another example: The word LOVE can be used to help Maciej remember the secret number 2525. Maciej has to remember a new secret number. Only three of the following words produce this new number. Which one does not?
1  2  3  4  5  6  7  8  9  0 
A  B  C  D  E  F  G  H  I  J 
K  L  M  N  O  P  Q  R  S  T 
U  V  W  X  Y  Z 
Nguyễn Linh Chi
09/08/2019 at 08:09Trần Mai Phương
07/08/2019 at 15:20Phạm Thanh Trúc
31/07/2019 at 01:46
Sarah Marianna 01/08/2019 at 04:40
Câu hỏi : Vừa bằng hạt đỗ , ăn giỗ cả làng . Là con gì ?
Câu trả lời : Là con ruồi .
Trần Bảo Nam
28/07/2019 at 23:40WilldaBeast
10/07/2019 at 15:07
William1 24/08/2019 at 13:16
hehe boi , can u solve ?
Quy Nguyen
02/07/2019 at 08:32
Quy Nguyen 02/07/2019 at 08:37
help me

Trần Bảo Nam 28/07/2019 at 23:37
It's too hard

Trần Bảo Nam 28/07/2019 at 12:38
\(18:\dfrac{1}{3}=6\)

Nguyen Duy Anh 24/06/2019 at 13:40
1/3 của 18 là 6

Kudo Shinichi 23/06/2019 at 09:39
It's 6
Nguyễn Hoàng An
22/06/2019 at 08:20Uchiha Sasuke
14/06/2019 at 02:09
Nguyễn Linh Chi 08/08/2019 at 09:44
\(f\left(a\right)=\sqrt{25a^230a+9}\)
\(g\left(a\right)=a\)
We have the following:
\(f\left(a\right)=g\left(a\right)+7\)
\(\Leftrightarrow\sqrt{25a^230a+9}=a+7\)
\(\Leftrightarrow\left\{{}\begin{matrix}25a^230a+9=\left(a+7\right)^2\\a+7\ge0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a\ge7\\24a^244a40=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a\ge7\\\left[{}\begin{matrix}a=\dfrac{5}{2}\\a=\dfrac{2}{3}\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}a=\dfrac{5}{2}\\a=\dfrac{2}{3}\end{matrix}\right.\)
Finally, there are two values of a.
Uchiha Sasuke selected this answer.
Uchiha Sasuke
14/06/2019 at 02:06
Lux Arcadia 14/06/2019 at 14:20
\(\dfrac{n17}{n+23}=\dfrac{n+2340}{n+23}=1\dfrac{40}{n+23}\)
\(\Rightarrow\left\{{}\begin{matrix}40⋮\left(n+23\right)\\n+23\ge23\left(n\ge0\right)\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}\left(n+23\right)\in\left\{1;2;4;5;8;10;20;40\right\}\\n+23\ge23\end{matrix}\right.\)
\(\Leftrightarrow n+23=40\Leftrightarrow n=17\)
Uchiha Sasuke
14/06/2019 at 02:05
Nguyễn Linh Chi 08/08/2019 at 10:01
We have: \(f\left(2\right)=5.2+1=11\)
\(f\left(1\right)=5.\left(1\right)+1=4\)
then: \(a=f\left(2\right)f\left(1\right)=11\left(4\right)=15\)
Hence: \(g\left(1\right)=a.1+3=15.1+3=18\)
Uchiha Sasuke selected this answer.
Uchiha Sasuke
09/06/2019 at 02:59
Đức Văn 11/06/2019 at 02:23
4:2=2cm

Trần Bảo Nam 28/07/2019 at 23:34
4:\(\dfrac{1}{2}\)= 2
Uchiha Sasuke
09/06/2019 at 02:55
Tôn Thất Khắc Trịnh 13/06/2019 at 03:46
So as to have the function be increasing, 2016m^{2} must be positive. Therefore, 2016 must be greater than m^{2}. Since 2016 is a positive number, m has to range from \(\sqrt{2016}\) to \(\sqrt{2016}\). In other words, m has to be between 44.899 and 44.899. Since m is a whole number, the minimal value of m is 44 and the maximum is 44. To calculate the number of values, we use this formula:
\(N=\frac{44(44)}{1}+1=89\)To conclude, there are 89 values of m such that the function is increasing.
Uchiha Sasuke selected this answer.