ElectricPavlov

3x can only =        3   6   or  9    corresponding to  x = 1         2          3

so y can only be                                                      y = 7         4          1        Three pairs

x/15 = 10/y

y = 150/x      you'll need to know what 'x' is to get a final answer

(6 w x 4 d ) / 3 m = 8 w-d/m              w = workers   d = day  m = meters

8 w-d / m   *  7 m  / 10 w  = 5.6 days

Your question is worded improperly.....

I will assume you want to know sis age when xing becomes half his father's age at the time  ...in the future

15+x = 1/2 (46+x)         where x is th years from now when xing reaches 1/2 father's age

.5x - 8

x = 16      more years        8+16 = sis age = 24 y/o

Just gather all of the 'like' terms:

(x⁴ +7x⁴) + ( 3x³ - 2x³) + ( - 5x² + x²)  + (-x + x)   + 1       Can you take it from here?  

(x-0)^2    + y^2 - 6y   = 16                       complete the square on x and y

(x-0)^2         + (y-3)^2    = 16+9              does that help?

                                                  Do you remember the standard form of a circle equation?

arrange in y = mx + b form      y = -1/2 x + 4        4 = b = y axis intercept

Total 15 liters

.8(x) + .65(17-x) = .71(15)         solve for 'x' the amount of 80%   then 65% =  17-x       

\(\sqrt[4]{4}\)  i       

-\(\sqrt[4]{4}\)  i  

r = -2

7 x r^9 = 10th term     7 x (-2)^9 = -3584