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sashaice [31]
3 years ago
13

A math question about proportions, help

Mathematics
2 answers:
LiRa [457]3 years ago
6 0
N=4.667 for that I think
insens350 [35]3 years ago
5 0
The answer is n=4.667
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Consider dealing a hand of 8 cards from a well shuffled standard deck of playing cards. The expected value of the number of face
zzz [600]

Answer:

2 face cards

Step-by-step explanation:

By definition, there are 12 face cards (Kings, queens, and jacks) and 36 numbered cards (2's through 10's) in a standard deck of 52 cards.  Aces are not considered face cards (no face on the card).

The ratio of face cards in a full deck is (12/52) or slightly over 23%.

The likelihood of a face card in a hand of 8 cards is:

(8 cards)*(12 face cards/52 cards) = 1.85 cards.  We need to round to the nearest whole card, so the expected number of face cards in a hand of 8 is 2 cards.  

8 0
2 years ago
I NEED HELP PEOPLE LAST TIME
Hoochie [10]

29.

f(x) = -x^2-7x-6

As x \to \pm \infty, y \to - \infty.

This can be easily verified by looking at the graph (graph of a quadratic equation).

30.

The growth of a population is not linear, it's exponential.

31.

Exponential growth > polynomial, so y = 3^x.

35.

V(t) = 30\cdot (25)^{\frac{t}{20}}

The question is asking V(t) for t = 40.

V(40) = 30\cdot (25)^{\frac{40}{20}} \\~\\V(40) = 30\cdot 25^2 \\~\\V(40) = 30\cdot 625 \\~\\V(40) = 18750

36.

The point of symmetry of a quadratic equation y = ax^2+bx+c is at its vertice:

V_x = \dfrac{-b}{2a}

V_x = \dfrac{6}{2}

V_x = 3

The line is x= 3.

3 0
3 years ago
The values of x and y vary directly
ss7ja [257]

Answer:

y = (1/4)x

Step-by-step explanation:

"Direct variation" here signifies y = kx, where k is the constant of proportionality.

Then y = kx.  Here we are to find k using the info that x = 12 and y = 3:

3 = k(12), or

k = 3/12, or k = 1/4

Then y = (1/4)x

6 0
3 years ago
Read 2 more answers
a movie theater has 24 screens. the ratio of action films to other films is 1:2 in the summer. how many action films are shown?
stiv31 [10]
12 action films are shown.
This is because if the ratio is 1:2, that means that exactly half of the total amount of movies are action. Thus, to evaluate this problem, you would find half of 24.
24 \div 2 = 12
5 0
3 years ago
For the function shown below, find f(3): f(x)=2x^4-8x^2+5x-7
a_sh-v [17]

We have been given the function

f(x)=2x^4-8x^2+5x-7

We have to find the value of f(3). In order to find the same, substitute x=3 in the given function.

f(3)=2(3)^4-8(3)^2+5(3)-7

Now, we simplify this step by step.

First of all 3^4=81\text{ and }3^2=9. Thus, we have

f(3)=2\times 81 -8\times 9+5(3)-7

Now, we can easily simplify it by PEMDAS

f(3)=162-72+15-7

f(3)=98


Therefore, the value of f(3) is 98.

3 0
3 years ago
Read 2 more answers
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