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Verdich [7]
3 years ago
15

If a= (4,-5) and b= (7,-9), what is the length of ab

Mathematics
2 answers:
Neko [114]3 years ago
8 0
The answer is 5 units.

faust18 [17]3 years ago
5 0
<span>A (4,-5)
B (7,-9)

</span>AB= \sqrt{(x_A-x_B)^2+(y_A-y_B)^2} \\  x_A=4; \ \ x_B=7; \ \ y_A=-5; \ \ y_B=-9; \\  \\ AB= \sqrt{(4-7)^2+(-5-(-9))^2}= \sqrt{(-3)^2+4^2} =   \sqrt{25}=5<span>
</span>
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abruzzese [7]

Answer:

27.385 cm longer would we expect Mike's arm span to be than George's.

Step-by-step explanation:

We have to find how many centimeters longer would we expect Mike's arm span to be than George's using the equation:

y= 4.5x + 0.977 x

where y= arm span

and x= height

Given:

Mike's height=x = 175 cm

so Mike's arm span= y= 4.5 x + 0.977 x

                                    = 4.5* (175) + 0.977* (175)

                                    = 787.5 + 170.975

                                    = 958.475 cm

George's height = x = 170 cm

so George's arm span= y= 4.5 x + 0.977 x

                                    = 4.5* (170) + 0.977* (170)

                                    = 765 + 166.09

                                    = 931.09 cm

Mike's arm span longer than George's = Mike's arm span - George's arm span

                                                                 = 958.475 - 931.09

                                                                 = 27.385 cm.

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