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3 years ago

What are the values of x in the equation x(x-6)=4(x+6)

1 answer:

7 0

<span>x(x-6) = x^2 - 6x 4(x+6) = 4x + 24 First we need to eliminate the bracket by multiplying the numbers and variables from outside the bracket with the inside, we weill get : X^2 - 6x = 4x + 24 (subtract 4x and 24 from both sides) x^2 - 10x - 24 = 0 (x+2) (x-12) = 0 x+2 = 0 x-12 = 0 The value of X would be : x = -2 x = 12 </span>

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Find exact value for cos(pi/16)

stellarik [79]

The exact value for cos(pi/16) would be :

cos (pi/16) = +/- √1+cosa/2

cos (pi/4) = sqrt2/2

Hope this helps

6 0

3 years ago

1. A sample consists of 75 TV sets purchased several years ago. The replacement times of those TV sets have a mean of 8.2 years.

Greeley [361]

Answer:

8.2+/-0.25

= ( 7.95, 8.45) years

the 95% confidence interval (a,b) = (7.95, 8.45) years

Step-by-step explanation:

Confidence interval can be defined as a range of values so defined that there is a specified probability that the value of a parameter lies within it.

The confidence interval of a statistical data can be written as.

x+/-zr/√n

Given that;

Mean x = 8.2 years

Standard deviation r = 1.1 years

Number of samples n = 75

Confidence interval = 95%

z value(at 95% confidence) = 1.96

Substituting the values we have;

8.2+/-1.96(1.1/√75)

8.2+/-1.96(0.127017059221)

8.2+/-0.248953436074

8.2+/-0.25

= ( 7.95, 8.45)

Therefore the 95% confidence interval (a,b) = (7.95, 8.45) years

3 0

2 years ago

2 diminished by 7 times a number

jolli1 [7]

The answer is 2-7x I'm 100% sure

3 0

2 years ago

What is the difference between 179 and 320

borishaifa [10]

Um... the answer is 141.

7 0

3 years ago

Solve the equation −2w+4=−12. URGENT Solution

VMariaS [17]

Answer:

The solution is w=8

Step-by-step explanation:

we have

-2w+4=-12

Solve for w

That means -----> isolate the variable w

Subtract 4 both sides

-2w+4-4=-12-4

-2w=-16

Divide by -2 both sides

-2w/-2=-16/-2

w=8

7 0

3 years ago