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3 years ago

UP TO 50 POINTS ON BRAINLY

Mathematics

1 answer:

Gnoma [55]3 years ago

7 0

Answer:

273.075 millions users

Step-by-step explanation:

We can use the date and users as x and y values for our graph.

point 1 = (1994, 37.5)

point 2 = (1998, 70.0)

point 3 = (2002, 102.5)

We know that linear equation can be represented as y = mx + b

where m is the slope and b is the y intercept value when x equal to 0.

m = (y2 -y1)/(x2-x1) = (102.5 - 37.5)/(2002 -1994)

m = 8.125

Now let's solve for b by using point3 values.

102.5 = 8.125(2002) +b

b = -16163.8

Now predict two years from now. Which is the year 2023.

For year 2023, how many mobile phone usage?

y = 8.125(2023) - 16163.8

y = 273.075 millions users

As for model robustness(reliability), it's fairly good be cause all three data points have consistent 8.125 slope. So the predictivity is fairly accurate.

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In triangle △ABC, ∠ABC=90°, BH is an altitude. Find the missing lengths. AB=4 and BC=3, Find AH, CH and BH.

IRISSAK [1]

Answer:

AH = 3.2
CH = 1.8
BH = 2.4

Step-by-step explanation:

It can be convenient to compute the length of the hypotenuse of this triangle (AC). The Pythagorean theorem tells you ...

AC^2 = AB^2 + CB^2

AC^2 = 4^2 + 3^2 = 16 + 9 = 25

AC = √25 = 5

The altitude divides ∆ABC into similar triangles ∆AHB and ∆BHC. The scale factor for ∆AHB is ...

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And the scale factor to ∆BHC is ...

scale factor ∆ABC to ∆BHC = BC/AC = 3/5 = 0.6

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