ElectricPavlov

10 liters total      x = 5%    10-x = 40%

amount of ingredients   =   final amount

.05 x    +  .40(10-x)     = .20 (10)     

                                      solve for 'x' the amount of 5%    then  10-x = 40% amount

Pick one of the points....it does not matter which ....and call it  x1, y1     the other is x2, y2

then slope =  (y1-y2)/(x1-x2)     

    try to do this ...see what you find.....

5000 represents 1/4 of the total cost of the car

   so car + int can cost   20 000

    removing interest   20 000 / (1.01) =  19801.98    I suppose answer C is the closest to true

x   from  -3   to  +3       1/3    would be -2      2/3 would be  +1

y   from  -2  to  +3         1/3 would be   -2 + 5/3 = -1/3      and   2/3 would be  -2 + 10/3 = 1 1/3

 (-2, -1/3)   and   (1,  1 1/3)  

4 + 2⁷ = 132

(4+2)⁷ = 4782969

Convert 244 cm to feet  = 8.00 ft

two walls at  16.25   x 8 ft     =   2  X   16.25   x  8  = 264 sq ft

two walls at   12.3    x 8 ft     =   2  x     12.3    x  8  = 196.8 sq ft       total = 460.8 sq ft

Amount of paint needed     460.8 ft²  /  350 ft²  / gal  = ........ gallons

10 km   +   5km/hr   *  x       = y

You should post this separately as a standalone question

x    first integer

x+1 = second integer   summed = 129

x     + x+1 = 129

2x = 128

x = 64       x+1 = 65

'a' slope =   (y1-y2)/ (x1-x2) =   (8-17)/(4-8) = -9/-4 = 9/4

parallel slope, m is the same = 9/4

New line     thru -12,20

(y-20) = 9/4 (x+12)

Sadie = s

Buddy = s+ 14

s       +      s+14     =  136       solve for 's'