Answer:
490
Step-by-step explanation:
Emily could start with the quadratic equation
... (2x+5)(2x+6)=31
... 4x² +22x +30 = 31
And then subtract the right side to put it into standard form.
... 4x² +22x -1 = 0 . . . . . . corresponds to the first selection
Addition: -9 + -2 = -11
Substraction: -9 - 2 = -11
The expected value of the number of points for each turn is 0.25
<h3>What is expected value?</h3>
Expected value describes the long term average level of a random variable based on its probabilty distribution.
Now, Probability that 2 heads come up is
P(2 is H) = 1/4
Probability that 1 heads come up is
P(1 is H) = 2/4
⇒P(1 is H) = 1/2
Probability that no head will come up
P(no H's) = 1/4
Hence, the expected value for winning of 2points, 1point and lose of3 points is given as-
Expected value = 2 * P(2 is H) + 1 * P(1 is H) - 3 * P(no H's)
⇒Expected value = 2 * 1/4 + 1 * 1/2 - 3 * 1/4
= 0.5 + 0.5 - 0.75
⇒Expected value = 0.25
More about Expected value :
brainly.com/question/22715250
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I had this question on an exam I took a few days ago. The answer is C. 245.
I think you have to multiply 35 by both sides, cancel the 35 with the 35 on the left to leave only x, and multiply 7 by 35 which = 245
