Solve the equation. 3x-35 = 25X + 16x = 1415

Solve the equation. 3x-35 = 25X + 16x = 1415

（1）3x-35=25，      3x-35+35=25+35，            3x=1，         3x÷3=1÷3，             x=13；（2）x+16x=1415，       76x=1415，    76x÷76=1415÷76，         x=45．

Given that the side area of a cone is 10 π square centimeter and the bottom radius is 2 cm, the generatrix length of the cone is 0______ Cm

From the meaning of the title: 10 π = 2 π × 2 × R △ 2, the solution is r = 5cm

If x = Y / 2 = Z / 3, find 2x-3x + 4z-3x + 4y-5z

x=y\2=z\3,
y=2x,z=3x,
2X—3y+4Z \-3x+4y—5z
=(2x-6x+12x)/(13x+8x-15x)
=8x/6x
=4/3

Two circles x ^ 2 + y ^ 2-2x-4y-4 = 0 and x ^ 2 + y ^ 2-8x-12y = 36 = 0 have an angle ()
I just want the answer, quick, thank you!
36 ahead+

X ^ 2 + y ^ 2-2x-4y-4 = 0 and x ^ 2 + y ^ 2-8x-12y = 36 = 0 (x-1) ^ 2 + (Y-2) ^ 2 = 9, Center (1,2), radius r = 3 (x-4) ^ 2 + (y-6) ^ 2 = 16, Center (4,6), radius r = 4, center distance d = √ [(4-1) ^ 2 + (6-2) ^ 2] = 5, angle between tangent and center line a, then tangent intersection angle is 2atana = (4-3) / 5 = 1 / 5A = arctan

How to divide 8 / 9 by 4 / 21 × x = 2 / 3

(4/21)/(8/9)X=2/3
=> 3/14X=2/3
=> X=28/9

It is shown by the collocation method that no matter what the value of X is, the value of the square-4x + 5 of the algebraic formula x is always greater than 0

x^2-4x+5 =(x-2)^2+1 (x-2)^2>=0 (x-2)^2+1>0

How much is minus 2 / 3 minus 1 / 2
How much is minus 3 / 4 minus 1 / 3

-7/6

Using elimination method to solve equations {3x + 4Y = 18,2x-3y = - 5

(3x+4y)*2=18*2
(2x-3y)*3=-5*3
17y=51
y=3
x=2

Given f (x) = - x ^ 3-2x + 4, prove that this function has and has only one zero point, and find out the approximate value of this zero point. (accurate to 0.1)
To complete the process, answer to the point. Urgent!

f'(x)=-3x^2-2

As shown in the figure, the intersection of the image of parabola y = AX2 + BX + C (a ≠ 0) and x-axis is (- 2,0), and the vertex is (1,3)
A. The axis of symmetry of the parabola is x = 1b. The opening of the parabola is downward C. the other intersection of the parabola and the X axis is (2,0) d. when x = 1, the maximum value of Y is 3

From the observation of the image, we can see that: A, ∵ vertex coordinates are (1,3), the symmetry axis of the parabola is x = 1, which is correct; B, from the graph, we can see that the opening of the parabola is downward, which is correct; C, ∵ an intersection of the image and the X axis is (- 2,0), the vertex is (1,3), ∵ 1 - (- 2) = 3, 1 + 3 = 4, which is the intersection of the parabola and the X axis