Markus has a box containing 10 red cards, 10 yellow cards, 10 blue cards and 10 green cards. He randomly selects one card, records the color, and then replaces the card in the box. If he does this 300 times, about how many times should Markus expect to draw a yellow card?

mental cunning

explanation:

he is often referred to as a man of twists and turns

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w