You draw a card at random from a deck that contains 3 black cards and 7 red cards.
What is P(draw a black card)?

The P(draw a black card) is 3/10.

Step-by-step explanation:

It is given that the deck contains 3 black cards and 7 red cards.

Therefore, the total number of cards in the deck = 7 red + 3 black = 10 cards.

Now, we need to find the possible outcomes of getting a black card. So, the number of black cards in the deck = 3 black cards.

The formula to find the probability is given by :

Probability = Number of required event / Total number of outcomes.

Here, the required event is getting a black card out of 10 cards in the deck.

Probability (to draw black card) = 3/10.

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

answer: finding the extract measurements and knowing the points

step-by-step explanation: