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slavikrds [6]
3 years ago
13

It took Mary 1.5 hours to bicycle 39km. Then she slowed down and took another 3 hours to bicycle 51 km more. Find her average sp

eed for the trip.
(Total 8 points; 4 points for the answer, 2 points for the units labeled and 2 points for work shown or explanation)
Mathematics
1 answer:
Goshia [24]3 years ago
4 0
39/1.5 = 26 km per hour
51/3 = 17 km per hour
Then you need the mean. 26+17/2 = 21.5 km per hour
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Question is in the picture. Please help
irakobra [83]

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BD = BD Reflexive property of a line (it is always equal to itself).

<ADB = <ADC = 90o

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Since each of the enclosed angles = 90, two have two triangles congruent by SAS <<<< Answer

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Ratling [72]
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Please help i'm so confused
umka21 [38]

Answer:

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8 0
3 years ago
If the second term of a geometric sequence of real numbers is -2 and the fifth term is 16 then what is the fourteenth term?
Agata [3.3K]
<h3>Given</h3>

A geometric sequence such that ...

a_2=-2\quad\text{and}\quad a_5=16

<h3>Find</h3>

a_{14}

<h3>Solution</h3>

We can use the ratio of the given terms to find the common ratio of the sequence, then use that to find the desired term from one of the given terms. We don't actually need the common ratio (-2). All we need is its cube (-8).

a_2=a_1r^{(2-1)}=a_1r^1\\a_5=a_1r^{(5-1)}=a_1r^4\\a_{14}=a_1r^{(14-1)}=a_1r^13=a_5r^9\\\\\dfrac{a_5}{a_2}=\dfrac{a_1r^4}{a_1r^1}=r^3=\dfrac{16}{-2}=-8\\\\r^9=\left(r^3\right)^3=(-8)^3=-512\\a_{14}=a_5(-512)\\\\a_{14}=-8192

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Yes! Yup your right! Congrats yup!
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