Let the focus of parabola y = 4x2 be f, then the coordinate of point F is______ ．

Let the focus of parabola y = 4x2 be f, then the coordinate of point F is______ ．

The standard equation of parabola y = 4x2 is x2 = 14y, the focus is on the positive half axis of Y axis, P = 18, P2 = 116, & nbsp; so the focus coordinate is (0116), so the answer is: (0116)

What is the square of √ (- 2)?

Square of √ (- 2) = 4 = 2

How much is ∫ (square of X + 2) DX equal? Please give a detailed calculation process

∫(x^2+2)dx
=ʃx^2dx+ʃ2dx
=1/3x^3+2x+C

The sixth grade students of a school donated 4000 yuan to the earthquake stricken area, accounting for four seventh of the total donations of the school, and the fifth grade students contributed 25% of the total donations,
How much money do the fifth graders donate?

4000÷4/7x25%
=7000x25%
=1750 yuan

The students of Chuncheng experimental primary school offered their love to the children in Sichuan earthquake stricken areas. The sixth grade donated 28.5% of the total donation
The students of Chuncheng experimental primary school give their love to the children in Sichuan earthquake stricken area. The sixth grade donation accounts for 28% of the total donation, and the fifth grade donation accounts for 30% of the total donation?

The total donation is x yuan
30%x-28%x=56
2%x=56
x=56/0.02
x=2800

There are 45 students in class 1, grade 6, who donated 1000 yuan, including 11 students
How do you do it?

It's not complete. It can't be done

There are three classes in Grade 6 donating to the earthquake stricken area. Class a donates 30% of the total amount. The ratio of class B and class C donates is 4:3. It is known that class a donates 660 yuan, and class B and class C each donate how much yuan

The three classes donated money in total
660 △ 30% = 2200 yuan
Class B and class C made donations:
2200-660 = 1540 yuan
Class B donation:
1540÷（4+3）×4
=220×4
=880 yuan
Donation from class C:
1540-880 = 660 yuan

Wang Hong has 100 yuan and Li Ming has 64 yuan. After Li Ming gives Wang Hong how many yuan, Wang Hong's money is three times as much as Li Ming's

Let Wang Hong have 3x yuan and Li Ming have X Yuan, so 4x = 100 + 64. Find x, then 64-x, and the answer is 23 yuan

Wang Hong and Li Ming each have several yuan. It is known that Li Ming has 20 yuan more than Wang Hong 6 / 5 times. If Li Ming gives Wang Hong 20 yuan, then Wang Hong has 9 / 10 of Li Ming's money first
It's a process

Let Li Ming have X Yuan and Wang Hong have y yuan
The solution of x = 6 / 5Y + 20, x-20 = 9 / 10 (y + 20) is x = 92, y = 60, so red has 60 and bright has 92 yuan

Wang Hong has 100 yuan and Li Mingyuan. After how much yuan does Li Ming give Wang Hong, Wang Hong's money is three times that of Li Ming?

Solve by equation
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