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3 years ago

Please help me with this I will mark you as brainliest!

Mathematics

2 answers:

Wittaler [7]3 years ago

5 0

Answer:

0.74

Step-by-step explanation:

Of the 30% of boys, 60% arrive by car, that is

60% of 30% = 0.6 × 0.3 = 0.18

Since 30% of the children at school are boys, then 70% are girls.

Of the 70% of girls, 80% arrive by car, that is

80% of 70% = 0.8 × 0.7 = 0.56

Probability of choosing a child from the school is

P( boy ) or P(girl) = 0.18 + 0.56 = 0.74

iragen [17]3 years ago

4 0

Answer:

.74

Step-by-step explanation:

First, you know that 30% are boys and 70% are girls. Then, take 60% of 30% and 70% of 80%. From there you get .74 as the probability of a randomly chosen child having taken a car to school.

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Online jewelry sales have increased steadily over the last 10 years. In 2003, sales were approximately 2 billion dollars, and in

KiRa [710]

Answer: (i) The unit rate at which online jewelry sales have been increasing is 1.33 billion dollars per year.

(ii) The online jewelry sales in 2019 will be 191.7 billion dollars.

Step-by-step explanation:

In 2003, sales were approximately 2 billion dollars and in 2010, they were approximately 14.8 billion dollars.

(i) If $x$ is the number of years after 2003 and $y$ is the amount of sales....

then the equation will be: $y= ab^x$ , where $a$ is the initial amount and $b$ is the growth rate.

for 2003, $x=0$ and for 2010, $x=7$

So, the two points in form of (x, y) will be: $(0,2)$ and $(7,14.8)$

Now plugging these two points int the above equation....

$2= ab^0\\ \\ a= 2\\ \\ and\\ \\ 14.8=ab^7\\ \\ 14.8=2*b^7\\ \\ b^7=7.4\\ \\b= \sqrt[7]{7.4}=1.3309.... \approx 1.33$

Thus, the online jewelry sales have been increasing at a rate of 1.33 billion dollars per year.

(ii) As we got $a=2$ and $b=1.33$ , so the equation will be now: $y= 2(1.33)^x$

For the year 2019, the value of $x$ will be: (2019-2003) = 16

So plugging $x=16$ into the above equation, we will get.....

$y=2(1.33)^16\\ \\ y=191.7150... \approx 191.7$

(Rounded to the nearest tenth)

Thus, the online jewelry sales in 2019 will be 191.7 billion dollars.

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3 years ago

What is a line segment

Stolb23 [73]

A line segment is a line between its endpoints.

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I need help with 12 and 13 pls!

balu736 [363]

Answer:

12 the midpoint is (2,5)

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Step-by-step explanation:

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2 years ago

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Which graph shows a line with an x-intercept of -5?

Finger [1]

Answer:

The answer is A.

Step-by-step explanation:

The only option is A. since an intercept of (-5,0)

Option B has y-int: (0,-5)
Option C has y-int: (0,5)

Option D has x-int(5,0)

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2 years ago

Given the north and east coordinates of point A (400,100), and point B (60,470), what are the distance and bearing from point A

Ugo [173]

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