1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
olchik [2.2K]
3 years ago
13

What is the rule for the following geometric sequence? 64,128,256,512...

Mathematics
2 answers:
professor190 [17]3 years ago
8 0

Answer:

B

Step-by-step explanation:

The explicit rule for a geometric sequence is

a_{n} = a₁ (r)^{n-1}

where a₁ is the first term and r the common ratio

Here a₁ = 64 and r = \frac{a_{2} }{a_{1} } = \frac{128}{64} = 2 , then

a_{n} = 64 (2)^{n-1} → B

antiseptic1488 [7]3 years ago
6 0

Answer:

b).

{ \tt{a _{n}  = a( {r}^{n - 1} )}} \\ { \tt{a _{n} = 64( {2}^{n - 1}) }}

You might be interested in
The ratio of boys to girls in a class is 3:4. There are 35 students in the class. How many more girls than boys are there?
lisov135 [29]

Answer:

5

Step-by-step explanation:

sum the parts of the ratio, 3 + 4 = 7 parts

Divide the number of students by 7 to find the value of one part of the ratio

35 ÷ 7 = 5 ← value of 1 part of the ratio, then

3 parts  3 × 5 = 15 ← number of boys

4 parts = 4 × 5 = 20 ← number of girls

20 - 15 = 5

There are 5 more girls than boys

4 0
3 years ago
Find the cubic equations with the given roots.<br> 1) 1,-3, and 5
MariettaO [177]
Ax3 + bx2 + cx + d = 0 where a 6= 0 All cubic equations have either one real root, or three real roots.
7 0
3 years ago
Please help me its due today
Semmy [17]

Answer:

8 pack is best to buy

Step-by-step explanation:

the cost for per piece base ball cap of 4 pack is 5.86 where as the per piece of 8 pack baseball is 5.84. 8 pack baseball cap is $0.02 cheaper

4 0
3 years ago
Read 2 more answers
Sally Sue had spent all day preparing for the prom. All the glitz and the glamour of the evening fell apart as she stepped out o
Nuetrik [128]

We have the function

p(t)=550(1-e^{-0.039t})

Therefore we want to determine when we have

p(t_0)=550

It means that the term

e^{-0.039t}

Must go to zero, then let's forget the rest of the function for a sec and focus only on this term

e^{-0.039t}\rightarrow0

But for which value of t? When we have a decreasing exponential, it's interesting to input values that are multiples of the exponential coefficient, if we have 0.039 in the exponential, let's define that

\alpha=\frac{1}{0.039}

The inverse of the number, but why do that? look what happens when we do t = α

e^{-0.039t}\Rightarrow e^{-0.039\alpha}\Rightarrow e^{-1}=\frac{1}{e}

And when t = 2α

e^{-0.039t}\Rightarrow e^{-0.039\cdot2\alpha}\Rightarrow e^{-2}=\frac{1}{e^2}

We can write it in terms of e only.

And we can find for which value of α we have a small value that satisfies

e^{-0.039t}\approx0

Only using powers of e

Let's write some inverse powers of e:

\begin{gathered} \frac{1}{e}=0.368 \\  \\ \frac{1}{e^2}=0.135 \\  \\ \frac{1}{e^3}=0.05 \\  \\ \frac{1}{e^4}=0.02 \\  \\ \frac{1}{e^5}=0.006 \end{gathered}

See that at t = 5α we have a small value already, then if we input p(5α) we can get

\begin{gathered} p(5\alpha)=550(1-e^{-0.039\cdot5\alpha}) \\  \\ p(5\alpha)=550(1-0.006) \\  \\ p(5\alpha)=550(1-0.006) \\  \\ p(5\alpha)=550\cdot0.994 \\  \\ p(5\alpha)\approx547 \end{gathered}

That's already very close to 550, if we want a better approximation we can use t = 8α, which will result in 549.81, which is basically 550.

Therefore, we can use t = 5α and say that 3 people are not important for our case, and say that it's basically 550, or use t = 8α and get a very close value.

In both cases, the decimal answers would be

\begin{gathered} 5\alpha=\frac{5}{0.039}=128.2\text{ minutes (good approx)} \\  \\ 8\alpha=\frac{8}{0.039}=205.13\text{ minutes (even better approx)} \end{gathered}

7 0
1 year ago
Which equation is equivalent to 2x+3y=12
Umnica [9.8K]

Answer:

Step-by-step explanation:

You could multiply it by 2.

4x+6y=24

5 0
3 years ago
Read 2 more answers
Other questions:
  • The probability that a house in an urban area will develop a leak is 55​%. if 2020 houses are randomly​ selected, what is the pr
    13·1 answer
  • A baseball pitcher won 80% of the games he pitched. if he won 28 games, how many games did he pitch at?
    5·1 answer
  • PLEASE HELP!! It’s for a math class and I can’t figure it out been trying every website nothing has helped!
    14·1 answer
  • The product of two numbers is 240. The first number is 8 less than the second number. Write an equation can be used to find x
    10·1 answer
  • I need help please . . . . i even upped the points . . .
    7·2 answers
  • Wade has $475 in a savings account at the
    6·1 answer
  • Mi-Young makes 24 cups of seafood kalguksu.This is 60% of the total kalguksu she makes.
    7·1 answer
  • Please help I need to get this done really bad
    15·1 answer
  • Picture of female reproducitve part​
    11·1 answer
  • Ski rentals are $100 plus $18 per hour, as shown in the table above.
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!