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Olenka [21]
3 years ago
7

SEQUENCES AND SERIES

Mathematics
1 answer:
Romashka [77]3 years ago
5 0

Answer:

Step-by-step explanation:

As we Know that formula for arithmetic sequence is

a_n=a_1+(d-1)

and for geometric sequence is

a_n=a1*r^(n-1)

So,

According to given conditions

     a+7d=a*r^5                              (i)\\ a+19d=a*r^7                           (ii)

By dividing equation (i) and (ii)

Hence proved that

r^2=a+19d/a+7d

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Demetrius deposits $120 iinto his account. One week later he withdraws $36. Write an addition sentence to represent this situati
Zolol [24]

Answer:

Demetrius's account is $84 higher after the two transactions

Step-by-step explanation:

Let

x -----> original amount in Demetrius's account

y ----> amount in Demetrius's account after the deposit and the withdraws

we know that

The amount in Demetrius's account after the two transactions must be equal to the original amount in Demetrius's account plus the deposit minus the withdraws

so

y=x+120-36

y=x+\$84

therefore

Demetrius's account is $84 higher after the two transactions

3 0
3 years ago
Helpppp Asapppp I’m timed
suter [353]

Answer:

The answer is the last one.

Step-by-step explanation:

When you do the others , they are step by step but when you do the last one, its just one step, which is -100.

Hope this helps :)

7 0
3 years ago
If i round 4,180 to the nearest thousand what will it be
dybincka [34]
The answer would be 4,000

6 0
3 years ago
If a line goes through the point (8,9) and has a slope of negative 3/4 what is the starting value?
scZoUnD [109]

I assume by starting value, you mean y-intercept. The y-intercept is 15

To find this, we need to use slope intercept form and the given information to find it.

y = mx + b ----> plug in the known values

9 = -3/4(8) + b

9 = -6 + b

15 = b

Therefore, the starting value is 15.

5 0
3 years ago
Jeffrey's brother max is 5 years older than twice Jeffrey's age. Write an expression that represents the relationship of Max's a
Illusion [34]
Jeffrey = J
Max = M

M = 2j + 5
4 0
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