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Svet_ta [14]
2 years ago
5

PLEASE HELP!!!!! In a card game, Alfred picks a card from a deck, notes the color, and then puts it back into the deck. Later, V

icky picks a card from
the same deck
In this experiment, the event that Alfred picks a card from the deck is independent of the event that Vicky picks a card from the
same deck. What can be changed in this experiment so that these events become dependent?
A. It is not possible to make the second event dependent of the first event.
B.
Alfred should not put the card back into the deck after picking a card.
C.
Vicky should pick a card from another deck.
D.
The deck should be split into two piles, and Alfred should pick from one pile, while Vicky picks from the other.
Mathematics
1 answer:
leva [86]2 years ago
3 0
I think it’s d but I’m not sure
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The chemistry class was making 300 gallons of 30% isopropyl alcohol. They mixed 12% with 42%. How much of each did they use?
alexgriva [62]

Answer:

<u>The chemistry class mixed 120 gallons of 12% isopropyl alcohol and 180 gallons of 42% isopropyl alcohol.</u>

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Amount of isopropyl alcohol made by the chemistry class = 300 of 30%

Amount of 12% isopropyl alcohol mixed by the chemistry class = x

Amount of 42% isopropyl alcohol mixed by the chemistry class = 300 - x

2. How much of each did they use?

Let's write our equation to solve for x, this way:

30% = 0.3, 12% = 0.12, 42% = 0.42

0.12x + 0.42 (300 - x) = 0.3 * 300

0.12x + 126 - 0.42x = 90

-0.3x = 90 - 126

-0.3x = -36

x = -36/-0.3

<u>x = 120 ⇒ 300 - x = 180</u>

<u>Let's prove x = 120 is correct</u>

0.12x + 0.42 (300 - x) = 0.3 * 300

0.12 * 120 + 0.42 (300 - 120) = 0.3 * 300

14.4 + 75.6 = 90

90 = 90

<u>We proved x = 120 is correct</u>

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3 years ago
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vladimir1956 [14]

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Find the sum of the given vectors and illustrate geometrically. [-1,4],[6,-2]
cricket20 [7]

Answer:

The sum of vectors is <5,2>.

Step-by-step explanation:

The given vectors are <-1,4> and <6,-2>.

We need to find the sum of the given vectors and illustrate geometrically.

Plot the point (-1,4) on a coordinate plane and draw a vector <a> from (0,0) to (-1,4).

Plot the point (6,-2) on a coordinate plane and draw a vector <b> from (0,0) to (6,-2).

Now complete the parallelogram and the diagonal represents the sum of both vectors.

The end point of the diagonal is (5,2). It means sum of vectors is <5,2>.

Check the sum of vectors:

+==

Therefore, the sum of vectors is <5,2>.

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would you prefer to purchase a cheap car which cost more to operate or to purchase a expensive car which cost less to operate? w
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Answer: Expensive car which cost less to operate.


Step-by-step explanation: When purchasing a new expensive car it is much more reliable, the risk you run with buying a used car is it breaking down on you while you are driving. Much less likely to happen with a new car.


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Corinna's cell phone bill was $52.75 in July.
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Answer:

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Explanation:

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hope this helps!

7 0
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