3 years ago

Can somebody help me solve this equation?

Mathematics

1 answer:

jolli1 [7]3 years ago

4 0

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What is the value of 2x(3+x/2) when x=−2?

Stolb23 [73]

Answer:

-8

Step-by-step explanation:

$2x(3+\frac{x}{2})$
$2*(-2)(3+\frac{(-2)}{2})$
$-4(3+(-1))$
$-4(2)$
$-8$

5 0

3 years ago

Hearts win. In a new card game, you start with a well-shuffled full deck and draw 3 cards without replacement. If you draw 3 hea

Afina-wow [57]

Answer: −1.409

Step-by-step explanation:

Probability of drawing 3 hearts: 13/52 * 12/51 * 11/50 = 0.013

Probability of drawing 3 black cards: 26/52 * 25/51 * 24/50 = 0.118

Probability of other draw: 1 - 0.013 - 0.118 = 0.869

0.013 * (50 - 5) = 0.585

0.118 * (25 - 5) = 2.353

0.869 * (0 - 5) = -4.347

Expected value: 0.585+ 2.353 - 4.347 = -1.409

7 0

4 years ago

The half - life of Barium-137m is 2.552 minutes. How much of an 18 gram sample would be left after 10 minutes

elena-s [515]

To simplify the problem imagine the half-life was 2.5 minutes. This means that there would be 10/2.5=4 periods of halving the mass, which means 1/2⁴=1/16 of 18g=1.125g.
So for the given half-life we calculate 10/2.552=3.9185 approx. So we now find 2 to this power=15.1211 approx and divide into 18=1.19g. This is close to the rough estimate we did earlier.

8 0

4 years ago

A barrel contained 60 gallons of water. Water leaked out of the barrel at a rate of 6 gallons every 3 days. At this rate, how ma

enyata [817]

60/6=10
10*3=30
30 days. Hope this helps :)

5 0

3 years ago

I need help on system of linear equations

jasenka [17]

What is your problem you are having?

6 0

4 years ago