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Oxana [17]
4 years ago
5

2 Points

Mathematics
1 answer:
ANTONII [103]4 years ago
6 0

Answer:

D

Step-by-step explanation:

This is called "implication". So if A (is true), then B MUST be true. If B is false, the implication is false. In all other cases, the implication is true. Suppose A is false, then it doesn't matter what B is, the implication is true, since we don't care what B is.

It's a bit confusing I suppose. Below is a truth table using P and Q in stead of A and B.

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If y = x + 5 and x = 3, then y = what?
Gennadij [26K]

y=8

Step-by-step explanation:

y=x+5 x=3

y=3+5

therefore

y=8

5 0
3 years ago
4|2x+7|=16<br> x=? and x=?
sammy [17]
4 | 2x + 7 | = 16...divide both sides by 4
| 2x + 7 | = 16/4
| 2x + 7 | = 4

2x + 7 = 4            -(2x + 7) = 4
2x = 4 - 7             -2x - 7 = 4
2x = -3                 -2x = 4 + 7
x = -3/2                -2x = 11
                             x = -11/2

so x = -3/2 and x = -11/2
5 0
4 years ago
The average home price in Massachusetts is $410,000, with a standard deviation of $65,000. A city planner is studying the distri
77julia77 [94]

Answer:

P(z

And replacing the value obtained we got:

z=-1.282

And if we solve for a we got

a=410000 -1.282*\frac{65000}{\sqrt{200}}=404107.68

Step-by-step explanation:

Let X the random variable that represent the average home prices of a population, and for this case we know the distribution for X is given by:

Where \mu=410000 and \sigma=65000

For this part we want to find a value a, such that we satisfy this condition:

P(X>a)=0.90   (a)

P(X   (b)

We want to find a value who accumulate 0.10 of the area on the left and 0.90 of the area on the right of the normal standard distributon and for this case it's z=-1.282

And using the distribution for the sample mean we can do this:

P(X  

P(z

And replacing the value obtained we got:

z=-1.282

And if we solve for a we got

a=410000 -1.282*\frac{65000}{\sqrt{200}}=404107.68

3 0
4 years ago
What is the value of x?: 18=31x
Andru [333]

answer

18/31

hope this helps

5 0
3 years ago
Read 2 more answers
I will mark you brainliest!!
stepan [7]

Answer:

C: .94

Step-by-step explanation:

7e^x=18

x=ln(18/7)

x=ln(2.5714)

x=.94

3 0
3 years ago
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