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3 years ago

If f(x) = x^2 + 3x – 2. find f(-2) .f(-2) = -4f(-2) = 4f(-2) = -2f(-2) = 2

Mathematics

1 answer:

Reptile [31]3 years ago

4 0

Answer:

f(-2) = - 4

Step-by-step explanation:

f(x) = x² + 3x - 2

f(-2) = ( -2)² + 3 *(-2) - 2

= 4 - 6 - 2

= 4- 8

= - 4

Hope it will help :)

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How to turn 1/4 divided by 6 into multiplication equation

laiz [17]

Answer:

1/4 × 1/6

Step-by-step explanation:

To turn a fraction division sentence into a multiplication sentence, simply multiply the second fraction by its reciprocal. For example: 1/4 ÷ 6/1 is equaled to 1/4 × 1/6.

I hope this helps!

5 0

3 years ago

A manager at a local company asked his employees how many times they had given blood in the last year. The results of the survey

Lubov Fominskaja [6]

Answer:

$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

$Sd(X) =\sqrt{2.3779}= 1.542 \approx 1.54$

Step-by-step explanation:

For this case we have the following distribution given:

X 0 1 2 3 4 5 6

P(X) 0.3 0.25 0.2 0.12 0.07 0.04 0.02

For this case we need to find first the expected value given by:

$E(X) = \sum_{i=1}^n X_i P(X_I)$

And replacing we got:

$E(X)= 0*0.3 +1*0.25 +2*0.2 +3*0.12 +4*0.07+ 5*0.04 +6*0.02=1.61$

Now we can find the second moment given by:

$E(X^2) =\sum_{i=1}^n X^2_i P(X_i)$

And replacing we got:

$E(X^2)= 0^2*0.3 +1^2*0.25 +2^2*0.2 +3^2*0.12 +4^2*0.07+ 5^2*0.04 +6^2*0.02=4.97$

And the variance would be given by:

$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

$Sd(X) =\sqrt{2.3779}= 1.542 \approx 1.54$

8 0

4 years ago

PLEASE HELP! Explain your answer, THANK YOU!

Misha Larkins [42]

Answer:

-2/-3

Step-by-step explanation:

(75, 60) (45, 40)

75 60 since 75 is larger than 45, we subtract = -30

45 40 since 60 is larger than 40, we subtract = -20

= -20/-30

reduce

= -2/-3

3 0

4 years ago

benny has a total of 64 quarters and pennies in his pocket. these coins total $4.00 how many pennies are in Benny's pocket

levacccp [35]

I think its 14 quarters and 50 pennies

8 0

4 years ago

A triangle has angles that measure 46 and 84<br><br> what is the third angle?

pentagon [3]

The measure of the third angle is 50 because a triangle has a sum of 180 degrees by angle.

so... 46+84=130 and to get to 180, the last angle has to be worth 50.

5 0

3 years ago

If f(x) = x^2 + 3x – 2. find f(-2) .f(-2) = -4f(-2) = 4f(-2) = -2f(-2) = 2​

If f(x) = x^2 + 3x – 2. find f(-2) .f(-2) = -4f(-2) = 4f(-2) = -2f(-2) = 2