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3 years ago

What is r÷10+4=5 in equations

Mathematics

1 answer:

Advocard [28]3 years ago

3 0

R=10
I know its right.

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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.

6 0

3 years ago

Formula of volume of hemisphere and sphere

Len [333]

Answer:

The volume of a hemisphere of some radius can be easily found out by calculating just half of the volume of a sphere of the same radius. Volume of hemisphere = 2πr3/3, where r is the radius of the hemisphere

Step-by-step explanation:

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2 years ago

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What’s the answer no wrong ones please.

allsm [11]

Hi! both of the data sets have 15 dots! so the difference is zero! ( 0 )

6 0

3 years ago

What is the diameter and radius?

vesna_86 [32]

Circumference C=2pi*r

But in question C=40pi

This implies that 2pi*r=40pi

This implies that r=20 in.

d=2*r=40 in.

Hope this helps :)

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3 years ago

This for math. Rewriting Fractions How do you decide which number to use in the Giant One?

ASHA 777 [7]

Answer:

factor of hundred is

100 - 1, 2,4,5,10,100

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3 years ago