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3 years ago

Pls help! URGENT ONLY DO QUESTION 21 PLS

Mathematics

1 answer:

Alekssandra [29.7K]3 years ago

4 0

Answer:

y = x - 8

Step-by-step explanation:

There's no magic method to doing these, and problem 21 makes it harder to see a pattern by using inputs that are not consecutive integers (like problem 20 does)!

Looking at inputs 20 and 21, the outputs are 8 less than the inputs. Check the other inputs and notice that the same pattern holds up.

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Solve the system of equations<br> 3x+4y+12<br> 9x-2y=15

Mrrafil [7]

3x+4y=12
9x-2y=15
we will use elimination
multiply 3x+4y=12 by -3

-9x-12y=-36
9x-2y=15
_________ add
-14y=-21
÷-14 both sides
y=1.5
find x
3x+4 (1.5)=12
3x+6=12
-6 both sides
3x=6
÷3 both sides
x=2

x=2
y=1.5

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3 years ago

Give four pairs of prime numbers whose difference is 2

zubka84 [21]

Answer:

(3, 1) (5, 3) (7, 5) (13, 11)

Step-by-step explanation:

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3 years ago

Read 2 more answers

Let x be the amount of time (in minutes) that a particular San Francisco commuter must wait for a BART train. Suppose that the d

larisa [96]

Answer:

a) $P(X$

$P(X>14) = 1-P(X$

b) $P(7< X$

c) We want to find a value c who satisfy this condition:

$P(x$

And using the cumulative distribution function we have this:

$P(x$

And solving for c we got:

$c = 20*0.9 = 18$

Step-by-step explanation:

For this case we define the random variable X as he amount of time (in minutes) that a particular San Francisco commuter must wait for a BART train, and we know that the distribution for X is given by:

$X \sim Unif (a=0, b =20)$

Part a

We want this probability:

$P(X$

And for this case we can use the cumulative distribution function given by:

$F(x) = \frac{x-a}{b-a} = \frac{x-0}{20-0}= \frac{x}{20}$

And using the cumulative distribution function we got:

$P(X$

For the probability $P(X>14)$ if we use the cumulative distribution function and the complement rule we got:

$P(X>14) = 1-P(X$

Part b

We want this probability:

$P(7< X$

And using the cdf we got:

$P(7< X$

Part c

We want to find a value c who satisfy this condition:

$P(x$

And using the cumulative distribution function we have this:

$P(x$

And solving for c we got:

$c = 20*0.9 = 18$

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3 years ago

Find the midpoint of points A(-6,9) and B(2,3) graphically.

daser333 [38]

I’m too lazy to draw a graph but
AB=[2-(-6) , 3-9] = (8,-6)
AB/2 = (8,-6)/2 = (8/2,-6/2) = (4,-3)
mind point of AB is (4,-3) just draw that on a graph and u got it

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4 years ago

If 5b -1= b, then 16b =

Marina CMI [18]

Answer:

80b-16

Step-by-step explanation:

16(5b-1)

8 0

3 years ago