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andrezito [222]
3 years ago
15

PLEASE HELP FAST IF YOU ARE GOOD AT GEOMETRY: AREA OF THESE SHAPES::

Mathematics
1 answer:
riadik2000 [5.3K]3 years ago
3 0

Answer:

1)24  2)36  3)240

Step-by-step explanation:

1) area of triangle = 1/2b*h so 7*4=28  28/2=14

therefore area =24

2)9*4=36

3)15*16=240

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How to find A1 in a geometric series for which sn= 105, r=-2 and n=6
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Here we're discussing the "nth partial sum of a geom series."

                                                        1 - r^n
The formula for that is s(n) = a(1) --------------- 
                                                          1-r

We can subst. the given values and see where that takes us:

                   1 - (-2)^6        1 - 64
105 = a(1)*---------------- = ----------*a(1)  =  -21*a(1)
                     1-(-2)                3

                                               105
Solving this for a(1):  a(1) = --------- = -5    (answer)
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