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3 years ago

What is the solution to the proportion 4/12=10/x

Mathematics

2 answers:

Nady [450]3 years ago

8 0

30, multiply 4 by 2.5 to get 10, then multiply 12 by 2.5 to get 30 (or x).

sergeinik [125]3 years ago

6 0

Hi Brainiac 4/12 = 10/x Use cross multiply 4x = 120 Divide both sides by 4 4x/4 = 120/4 X = 30 The answer is A I hope that's help :)

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A standard roulette wheel has 38 numbered slots for a small ball to land in: 36 are marked from 1 to 36, with half of those blac

Anastasy [175]

Answer:

The expected value of betting $500 on red is $463.7.

Step-by-step explanation:

There is not a fair game. This can be demostrated by the expected value of betting a sum of money on red, for example.

The expected value is calculated as:

$E(G)=\sum p_iG_i$

being G the profit of each possible result.

If we bet $500, the possible outcomes are:

- Winning. We get G_w=$1,000. This happens when the roulette's ball falls in a red place. The probability of this can be calculated dividing the red slots (half of 36) by the total slots (38) of the roulette:

$P(R)=R/T=18/38\approx0.4737$

- Losing. We get G_l=$0. This happens when the ball does not fall in a red place. The probability of this is the complementary of winning, so we have:

$P(not \,R)=1-P(R)=1-18/38=20/38\approx 0.5263$

Then, we can calculate the expected value as:

$E(G)=\sum p_iG_i=p_wG_w+p_lG_l=0.4637*1,000+0.5263*0=463.7$

We expect to win $463.7 for every $500 we bet on red, so we are losing in average $36.3 per $500 bet.

4 0

3 years ago

In △UVW,△UVW, VW≅UV and m∠U=71∘.Find m∠W. please help will mark brainliest

navik [9.2K]

Answer:

71 degrees

Step-by-step explanation:

its an isosceles triangle so those angles are equal. Draw it out if that helps you.

5 0

3 years ago

HURRYYY please pleaseee

Black_prince [1.1K]

The correct answer is A

4 0

3 years ago

During a certain day, a worker made 81 parts. He usually does 45 parts per day. What was the percent by which he increased the n

Lana71 [14]

Answer:

The answer is 80%.

Step-by-step explanation:

During a certain day, a worker made 81 parts.

He usually does 45 parts per day.

Number of extra parts made = $81-45=36$

The percent by which he increased the number of parts he usually makes can be given as = $\frac{36}{45}\times100$ = 80%

Therefore, on that day, the percent increased by 80%.

6 0

3 years ago

PLEASE PLEASE HELP WITH THIS

Phoenix [80]

Since triangles ABC and BCD are similar, we can establish a proportion between the lengths of corresponding sides:
$\frac{AC}{BC} = \frac{BC}{CD}$

We can infer from our picture that $BC=m$ . Also we can find the length of AC by adding AD and CD:
$AC=AD+CD$
$AC=11+7$
$AC=18$

Lets replace the values in our proportion:
$\frac{AC}{BC} = \frac{BC}{CD}$
$\frac{18}{m} = \frac{m}{7}$
Solving for $m$ :
$m^2=(18)(7)$
$m^2=126$
$m= \sqrt{126}$

We can conclude that the correct answer is: D $\sqrt{126}$

4 0

3 years ago