Here can somebody help me with this problem

H, 40%

Step-by-step explanation:

We can start out simple by finding out the number of cars in each category.

30 remote-controlled cars

90 non remote-controlled cars.

20% of the remote controlled cars are yellow, meaning that there are 6 yellow remote controlled cars.

Since 50% of the total cars are yellow, there are 60 yellow cars. Subtracting this from the yellow remote controlled cars, there are 54 yellow non remote contolled cars.

What this means is that 54/90 of the non-remote cars are yellow, and 36/90 of the non-remote cars are yellow. 36/90 is just 2/5, which means that our answer is H, 40%.

The answer to your question is:

1) x = 4

2) x = -2

Step-by-step explanation:

a)                     (x-3)² = x^{2} - 10x +25

                     x² - 6x + 9 = x² - 10x + 25

                    10x - 6x = 25 - 9

                     4x = 16

                     x = 4

b)

                                   (x+4)³ = x³ + 12x² - 16x

               x³ + 3(x²)4 + 3x(16) + 4³= x³ + 12x² - 16x

              x³ + 12x² + 48x + 64 = x³ + 12x² - 16x

               48x + 64 = 16x

               48x - 16x = -64

                32 x = -64

                x = -64/2

               x = -2