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GarryVolchara [31]
3 years ago
6

What is the common ratio for 128, 96, 72, 54,....

Mathematics
1 answer:
VLD [36.1K]3 years ago
7 0

Answer:

Step-by-step explanation:

r=96/128=3/4

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An arithmetic sequence has t1 = 3, t2 = 10. Find tn, Sn.
Softa [21]

Answer:

see explanation

Step-by-step explanation:

the n th term of an arithmetic sequence is

t_{n} = t_{1} + (n - 1)d

given t_{1} = 3 and t_{2} = 10, then

t_{2} = 3 + d = 10 ⇒ d = 10 - 3 = 7

t_{n} = 3 + 7(n - 1) = 3 + 7n - 7 = 7n - 4

the sum to n terms of an arithmetic sequence is

S_{n} = \frac{n}{2}[2t_{1} + (n - 1)d ]

                        = \frac{n}{2}[(2 × 3) + 7(n - 1) ]

                        = \frac{n}{2}(6 + 7n - 7 )

                        = \frac{n}{2}(7n - 1)

                        = \frac{7}{2} n² - \frac{1}{2} n



7 0
3 years ago
When the length of each side of a square is increased by 5 cm, its area is increased by 895 cm2. Find the length of a side befor
Ann [662]

Answer:

Step-by-step explanation:

Increasing the side length by 5 is represented as s + 5. To get the area of a square we multiply side times side: (s+5)^2=s^2+10s+25

The area of a square is s². If we are increasing this area s² by 895, then to represent this we have s² + 895.

Put that together into an equation:

s^2+10s+25=s^2+895 and simplify to

10s = 870 so

s = 87

Let's check that. The area before the addition to the side is 87*87 = 7569; the area after the addition of 5 cm is 92*92 = 8464. The difference is

8464 - 7569 = 895 so we did good!

7 0
3 years ago
The quotient of a number and -7, decreased by 2, is 10
Mars2501 [29]

Answer:

wouldnt it be -9

Step-by-step explanation:

beacuse negitive 7-2 is negitive 9 bc negitive plus a negitive is a negitive ?? right

3 0
3 years ago
In a triangle the ratio of angles is 2:3:4 find the angles​
Dmitry [639]

Answer:

40,60,80

Step-by-step explanation:

2x+3x×4x=180

9x=180

x=20

2x=40

3x=60

4x=80

6 0
3 years ago
How many times must i ask :(
Solnce55 [7]

Step-by-step explanation:

ask for what, if you need help you

5 0
3 years ago
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