3 years ago

Help with question 3

Mathematics

1 answer:

slega [8]3 years ago

4 0

6.4166666666666666666667

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Find the sum of the geometric series given a1=2, r=−3, and n=8.

inn [45]

Answer:

Sum of the G.P is -3280

Step-by-step explanation:

Summation:

${ \bf{sum = \frac{a( {r}^{n }-1 )}{r - 1} }} \\ \\ { \tt{sum = \frac{2( { { - 3}^{8 } -1)} }{ - 3 - 1} }} \\ { \tt{ = \frac{13120}{-4} }} \\ = -3280$

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3 years ago

Read 2 more answers

Find the common ratio of the following geometric sequence.

Elanso [62]

The answer is (4/5). If you multiply the first (5/12) over and over, you get this sequence.

8 0

3 years ago

F(x)=x^(2)+3x+4 is this quadratic, linear, or neither

goblinko [34]

Quadratic
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2 years ago

PLZ HELP INSCRIBED ANGLES

den301095 [7]

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7 0

3 years ago

Joe sold a total of 10 baked goods. Each cookie costs $1.25 and each brownie costs $2.50. Joe made $20 at the bake sale. How man

AURORKA [14]

Answer:

4 cookies

Step-by-step explanation:

Let the number of cookies he sold be c and that of brownies be b.

Assuming that brownies and cookies are the only type of baked goods sold,

b +c= 10 -----(1)

Amount of money received= $20

b(cost of brownie) +c(cost of cookie)= $20

2.50b +1.25c= 20 -----(2)

From (1): b= 10 -c -----(3)

Substitute (3) into (2):

2.50(10 -c) +1.25c= 20

Expand:

2.50(10) +2.50(-c) +1.25c= 20

25 -2.50c +1.25c= 20

-1.25c +25= 20

Being constants to 1 side:

-1.25c= 20 -25

-1.25c= -5

c= -5 ÷(-1.25)

c= 4

Thus, Joe sold 4 cookies.

8 0

2 years ago