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3 years ago

15

7 + (-2) is units from 7, in the direction. 7+(-2) =

1 answer:

faltersainse [42]3 years ago

3 0

I might be wrong.
7+(-2)= -9

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A water well is to be drilled in the desert where the soil is either rock, clay or sand. The probability of rock P(R)equals=0.

GaryK [48]

The tree diagram for the probability is shown below

P(Clay|Positive) is read 'Probability of Clay given the result is Positive'.

This is a case of conditional probability.

The formula for conditional probability is given as
P(Clay|Positive) = P(Clay∩Positive) ÷ P(Positive)

P(Clay∩Positive) = 0.21×0.48 = 0.1008

P(Positive) = P(Rock∩Positive) + P(Clay∩Positive) + P(Sand∩Positive)
P(Positive) = (0.53×0.53) + (0.21×0.48) + (0.26×0.75)
P(Positive) = 0.2809 + 0.1008 + 0.195
P(Positive) = 0.5767

Hence,
P(Clay|Positive) = 0.1008÷0.5767 = 0.175 (rounded to 3 decimal place)

5 0

3 years ago

Determine the equation of the circle graphed below.

marishachu [46]

Answer:

$(x + 7)^2 + (y + 4)^2 = 4$

Step-by-step explanation:

The equation of a circle with radius r and center (h, k) is:

$(x - h)^2 + (y - k)^2 = r^2$

This circle has center (-7, -4) and radius 2.

The equation is:

$(x + 7)^2 + (y + 4)^2 = 4$

5 0

3 years ago

Solve x:<br> 4 - 4x = 40<br> --Please Help! This is homework due in for Monday! Xx

salantis [7]

Hello!

<u><em>Answer: x=-9 *The answer must have negative sign*</em></u>

Explanation:

First you had to do is subtract by 4 from both sides of an equation.

$4-4x-4=40-4$

Then, simplify.

$-4x=36$

Divide by -4 both sides of an equation.

$\frac{-4x}{-4}= \frac{36}{-4}$

Finally simplify.

$36/4=9$

It change positive to negative sign.

$x=-9$

Hope this helps!

Thanks!

Have a great day!

-Charlie

7 0

3 years ago

Write the equation of the line in slope intercept form.

sergey [27]

Answer:

see below

Step-by-step explanation:

slope intercept form: y=mx+b

you are given the slope, and can plug the points in to find b.

a) -3=2/3(6)+b --> b=-7

y=2/3x+7

b)10=-8(1/2)+b --> b=14

y=1/2x+13

c)4=-3(2)+b --> b=10

y=-3x+10

6 0

2 years ago

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I need help what is 2,830 ÷ 28 =? Step-by-step pls

goldfiish [28.3K]

Answer: 101 with a Remainder of 2

Step-by-step explanation:

7 0

1 year ago

Read 2 more answers