3 years ago

Find an explicit rule for the nth term of the sequence. -3, -15, -75, -375, ...

Mathematics

2 answers:

Helga [31]3 years ago

6 0

The answer is B, I have just confirmed it.

koban [17]3 years ago

4 0

It's a geometric progression where
$a=-3\\
r=5$

$a_n=ar^{n-1}\\
a_n=-3\cdot5^{n-1}$

You might be interested in

the perimeter of a rectangle is 55 inches. the ratio of the length to width is 7:4. use proportions to find the area of the rect

Leni [432]

Answer:

Step-by-step explanation:

let : x the length and y the width .... ( x > y and x ; y reals numbers )

the perimeter is : 2(x+y)

2(x+y) = 55...(1)

x/y = 7/4 ...(2)

by (2) : x = (7/4)y

subsct in (1) : 2( (7/4)y +y ) =55

(7/2)y +2y =55

multiply by 2

7y +4y = 110

11y = 110

y = 10

x = (7/4)(10)

x = 35/2

4 0

3 years ago

How would 2.25 be represented as a percent? A. 225% B. 22.5% C. 2.25% D. 0.0225

ivolga24 [154]

Answer:

Step-by-step explanation:

move decimal two places to get percent

2.25 = 225%

6 0

3 years ago

What is the area of the triangle? On a coordinate plane, a triangle has a base of 8 units and a height of 6 units. 24 square uni

LekaFEV [45]

Answer:

Step-by-step explanation:

8*6=48/2=24

6 0

3 years ago

Read 2 more answers

An unfair coin with Pr[H] = 0.75 is flipped. If the flip results in a head, a student is selected at random from a class of si

Agata [3.3K]

Answer:

72.73% probability of selecting a girl, given the flip resulted inheads

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

Coin resulted in heads

Student is selected at random from a class of six boys and sixteen girls.

Desired outcomes:

16 girls, so $D = 16$

Total outcomes:

16+6 = 22, that is, 22 students, so $T = 22$

Probability:

$P = \frac{16}{22} = 0.7273$

72.73% probability of selecting a girl, given the flip resulted inheads

7 0

3 years ago

Find the circumference of a circle with a radius of 5 cm. Round your

Verizon [17]

31.4
Hope that helps you!

7 0

3 years ago