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zlopas [31]
2 years ago
11

Which formula can be used to find the nth term in a geometric sequence where a1=3 and r=2 ?

Mathematics
2 answers:
egoroff_w [7]2 years ago
8 0
1st term =a₁ = 3,  r=2

1st a₁   = 3 x 2⁰
2nd a₂  = 3 x 2¹
3rd a₃  =  3 x 2²
4th a₄   = 3 x 2³
5th a₅   = 3 x 2⁴
.......................
.......................
nth : a(n) = 3 x 2⁽ⁿ-¹)
Note when that the subscript of a is the same as the exponent mines 1
shusha [124]2 years ago
7 0
A(n)=a(1)*r^(n-1)

a(n)=3*2^(n-1)

Hope I don't mess up for your sake.
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In the same amount of time, James drove twice as far as Roger. Altogether, James and Roger drove 90km. Find the number of kilome
miskamm [114]

Answer:

james drove 60 and roger drove 30

Step-by-step explanation:

90/3= 30= roger

90/3=30x2=60= james

james(60)+roger(30)= 90

8 0
2 years ago
PLEASE HELP!!!What are good 3 examples of Geography?WILL GIVE BRAIN!!!
zvonat [6]

Answer:

The three main types of geography are physical, environmental and human geography. There are other sub-branches of geography such as political geography, historical geography and religious geography.

Physical geography deals with the study of Earth and its structure. The landforms, continents, oceans and tectonic movements are a part of physical geography. The formation of rocks, weathering, forces of erosion, winds, ocean currents and rivers are all studied as a part of physical geography. Environment geography deals specifically with the study of the interaction of plants and animals with Earth. Human geography focuses on how human societies flourish with the help of natural resources. It deals with the study of the evolution of cultures and religious beliefs. Economic, cultural and political geography are sub-branches of human geography.

Step-by-step explanation:

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8 0
2 years ago
I need help with the incorrect ones please
Morgarella [4.7K]

Answer:

73.6

61.824

.2776

2.3

1.342

.4129

*note* I had trouble reading the standard deviation of the second part, so if it's not 3 then leave a comment and i will fix it*

Step-by-step explanation:

1.)

the mean would be something like 460*.16= 73.6

The variance should be 460*.16(1-.16)= 61.824 which means the standard deviation is √61.824= 7.863

for p to be less than .15 it would have to be less than .15*460= 69

(69-73.6)/7.863= -.59 which has a probability of .2776

2.)

the mean is 2.3

I am not sure if the standard deviation is 3 or .3 (picture is kind of blurry)

I am thinking that it's three which would mean that the standard deviation would be √(3²*(1/5))= 1.342

(2-2.3)/1.342= -.22 = .4129

5 0
2 years ago
A city planner wants to build a road parallel to 2nd Ave . What is the slope of the new road?
ludmilkaskok [199]

Answer:

0

Step-by-step explanation:

By inspection or finding points, we see that 2nd ave is perfectly flat, or in other words, has slope of 0.

If line 1 is parallel to line 2, it means their slopes are the same.

So, the new road parallel to 2nd ave has a slope of \boxed{0}.

6 0
2 years ago
What is the formula for the area of a triangle and a square again?
Tatiana [17]

1/2 X base X height= triangle

length X width X height= square

5 0
2 years ago
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