Answer:
x = -2i and x = 2i
x = 3 and x = - 3
Step-by-step explanation:
x^4 - 5x^2 - 36 = 0
let u = x^2 and substitute
we have:
u^2 - 5u - 36 = 0
(u - 9)(u + 4) = 0
u = 9 and u = - 4
substitute back for u
x^2 = 9
x = 3 and x = - 3
x^2 = -4 -- i am going to assume you've learned imaginary numbers; otherwise, you cannot take the square root of a negative number.
x = -2i and x = 2i
Answer:
Not Sure
Step-by-step explanation:
Here's something that might help though:
Do 8% of 20
Then 14% of 20
That's all I got for ya... sorry, I tried my best!
dlqndpQAI:?s
Step-by-step explanation:
Answer:
A. Selecting one person from a group of four boys and two girls.
Step-by-step explanation:
A dice has six sides and here we have six people we're trying to choose from. If each person is assigned a number on the dice rolling the dice once will pick out of the six of them.
Answer:
1/24 = 0.0417 (3 sf) = 4.17% (3 sf)
Step-by-step explanation:
- Probability is how likely something is to happen
- The probability of an event happening = (number of ways it can happen) ÷ (total number of outcomes)
With a number cube there are 6 outcomes: 1, 2, 3, 4, 5 or 6
So the probability of rolling any of these 6 numbers is = 1/6
⇒ probability of rolling a 3 = 1/6
The probability of rolling an even number = the probability of rolling a 2 OR a 4 OR a 6 = 1/6 + 1/6 + 1/6 = 3/6
As rolls are independent from any other rolls, the probability of the second and third roll will not be affected by the first or second roll.
We can calculate the chances of two or more independent events by multiplying the chances.
Therefore, the probability of getting an even number AND an even number AND a 3 = 3/6 x 3/6 x 1/6 = 1/24
