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4 years ago

Brian, Tim and Kenny got paid a total of $240 for mowing neighborhood lawns. They split the money in the ratio of 5: 9: 10.

Mathematics

1 answer:

victus00 [196]4 years ago

7 0

Brain and both worked for the day and they well both get 120 dollars each

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Shaaz wants to paint a chalkboard that measures 18 meters by 12 meters. The cost to paint is 2.1 dirhams per square meter. How m

zloy xaker [14]

Answer:

453.60 Dirhams

Step-by-step explanation:

This is simple. Follow me!

18 meters × 12 meters = 216 square meters

216 square meters × 2.1 dirhams/square meter

= 453.6 dirhams

Woo-hoo! We did it!

Brainliest Appreciated, if you have any questions feel free to comment!

7 0

2 years ago

Read 2 more answers

Mr.Hall stands 200 meters from the base of the water tower. He finds the angle of elevation to the top of the water to be 27 deg

gayaneshka [121]

Answer:

227

Step-by-step explanation:

Just add :)

5 0

4 years ago

Solve 3x − 2 < 7 or −2x+3<−15

lana [24]

Answer:

x<3

where x does not exist

(-infinity, 3)

Where x exists

[3, infinity]

Step-by-step explanation:

I'm just going to answer the first one.

Treat it like your solving for x, however the only difference is that it's an inequality.

3x-2 <7

3x< 7+2

3x/3x < 9/3

x<3

Now we know where x does and does not exist.

I'm assuming your teacher wants that, (-infinity, 3) (this is where it does not exist)

[3, infinity]

In case you were wondering square brackets is where it exists and curled is where it doesn't.

4 0

3 years ago

Suppose you deposit $2,500 in a savings account that pays interest at an annual rate of 5%. If no money is added or withdrawn

lukranit [14]

Answer:

the answer would be c.

Step-by-step explanation:

8 0

3 years ago

Of all customers purchasing automatic garage-door openers, 75% purchase Swedish model. Let X = the number among the next 15 purc

Lelechka [254]

Answer:

$P(X=k) = {15 \choose k} * 0.75^{k}*0.25^{15-k}$

For any integer k between 0 and 15, and 0 for other values of k.

$P(X>10) = 0.2252+ 0.2252+ 0.1559+0.0668+0.0134 = 0.6865$

c) P(6 ≤ X ≤ 10) = 0.2737

d) μ = 15*0.75 = 11.25. σ² = 11.25*0.25 = 2.8125

Step-by-step explanation:

X is a binomial random variable with parameters n = 15, p = 0.75. Therefore

$P(X=k) = {15 \choose k} * 0.75^{k}*0.25^{15-k}$

For any integer k between 0 and 15, and 0 for other values of k.

P(X>10) = P(X=11) + P(X=12)+ P(X=13)+P(X=14)+P(x=15)

$P(X=11) = {15 \choose 11} * 0.75^{11} * 0.25^4 = 0.2252$

$P(X=12) = {15 \choose 12} * 0.75^{12} * 0.25^3 = 0.2252$

$P(X=13) = {15 \choose 13} * 0.75^{13} * 0.25^2 = 0.1559$

$P(X=14) = {15 \choose 14} * 0.75^{14} * 0.25 = 0.0668$

$P(X=15) = {15 \choose 15} * 0.75^{15} = 0.0134$

Thus,

$P(X>10) = 0.2252+ 0.2252+ 0.1559+0.0668+0.0134 = 0.6865$

c) P(6 ≤ X ≤ 10) = P(X = 6) + P(X = 7) + P(X = 8) + P(X=9) + P(X=10)

$P(X=6) = {15 \choose 6} * 0.75^{6} * 0.25^9 = 0.0034$

$P(X=7) = {15 \choose 7} * 0.75^{7} * 0.25^8 = 0.0131$

$P(X=8) = {15 \choose 8} * 0.75^{8} * 0.25^7 = 0.0393$

$P(X=9) = {15 \choose 9} * 0.75^{9} * 0.25^6 = 0.0918$

$P(X=10) = {15 \choose 10} * 0.75^{10} * 0.25^{5} = 0.1652$

Thereofre,

$P(6 \leq X \leq 10) = 0.0034 + 0.0134 + 0.0393 + 0.0918 + 0.1652 = 0.2737$

d) μ = n*p = 15*0.75 = 11.25

σ² = np(1-p) = 11.25*0.25 = 2.8125

3 0

3 years ago