Please help will give Brain

X=-4+y and -2x-5y=15

Scrat [10]

Answer:

x=-5, y=-1

Step-by-step explanation:

Substitute x=-4+y into -2x-5y=15. So we have

-2(-4+y)-5y=15

8-2y-5y=15

-7y=7

y=-1

And x is -4+y so x= -4+(-1)= -5.

7 0

3 years ago

How do I do this activity, help is appreciated

Kitty [74]

This is fairly easy, all you need to do is write the ordered pairs for each graph, for these there are 5 ordered pairs for both.

In order to create the ordered pair all you need is this 'formula' of (x, y)

In the first graph 'input' would be the x value and output is the y value. So all you do is plug them into the formula.

(-10,-20)
(-5,-10)
(0,0)
(5,10)
(10,20)

Those are all the ordered pairs for graph A. Now just do the same thing for graph B.

8 0

4 years ago

A probability calculator is required on this problem; answer to six decimal places. Suppose we will spin the wheel pictured 400

KiRa [710]

Answer:

$P(90< X< 110)= P(\frac{90-80}{8}$

And we can find this probability with this difference:

$P(90< X< 110)=P(z$

And we can find the real value with the following excel code using the binomial distribution:

"=BINOM.DIST(110,400,0.2,TRUE)-BINOM.DIST(89,400,0.2,TRUE)"

And we got 0.118 a very close value from the value obtained using the normal approximation

Step-by-step explanation:

Previous concepts

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

Let X the random variable of interest, on this case we now that:

$X \sim Binom(n=400, p=0.2)$