Answer:
25-5x=90
Step-by-step explanation:
not sure but i think this is it
Using the probability table, it is found that:
- a) There is a 0.25 = 25% probability that this couple spends 45 dollars or more.
- b) The expected amount the couple actually has to pay is $36.85.
Item a:
To find the probabilities involving the total cost, we have to <u>add the variables X and Y</u> from the table, then:
The probability involving <u>values of 45 or more</u> is:
0.25 = 25% probability that this couple spends 45 dollars or more.
Item b:
For a <em>discrete distribution</em>, the expected value is the <u>sum of each outcome multiplied by it's respective probability</u>, hence, involving the 10% discount for prices above $45:
The expected amount the couple actually has to pay is $36.85
A similar problem is given at brainly.com/question/25782059
X•3-10 x represents yesterday’s temperature
Answer:
the answer is
Step-by-step explanation:
Answer: x = -1, y = 1, z = 0
<u>Step-by-step explanation:</u>
EQ 1: -2x + 2y + 3z = 0 ⇒ 1(-2x + 2y + 3z = 0) ⇒ -2x + 2y + 3z = 0
EQ 2: -2x - y + 3z = -3 ⇒ -1(-2x - y + 3z = -3) ⇒ <u> 2x + y - 3z</u> = <u>3 </u>
3y = 3
y = 1
EQ 1: -2x + 2y + 3z = 0 ⇒ -2x + 2(1) + 3z = 0 ⇒ -2x + 2 + 3z = 0
EQ 3: 2x + 3y + 3z = 5 ⇒ 2x + 3(1) + 3z = 5 ⇒ <u> 2x + 3 + 3z</u> = <u>5 </u>
5 + 6z = 5
6z = 0
z = 0
EQ 1: -2x + 2y + 3z = 0
-2x + 2(1) + 3(0) = 0
-2x + 2 = 0
-2x = -2
x = -1