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rjkz [21]
3 years ago
13

Which sequence is modeled by the graph below?

Mathematics
2 answers:
zlopas [31]3 years ago
6 0
First, we inspect what type of sequence is the order of the coordinates:
a2 = 1
a3 = 2
a4 = 4

Getting the difference,
a3 - a2 = 1
a4 - a3 = 2

The differences are not equal; hence, the sequence is not arithmetic.

Getting the ratio:
a3/a2 = 2
a4/a3 = 2

The common ratio is 2. Using the general form for a geometric series:
an = a1 r^(n-1)
If n = 2
1 = a1 (2)^(2-1)
a1 = 1/2

So,
an = (1/2) (2)^(n-1)

The answer is the first option.
strojnjashka [21]3 years ago
6 0

Answer:

an = one half(2)n − 1

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Five students wrote a mathematics test. The average mark was 68. If the marks for four of the students were 75, 62, 84 and 53, t
konstantin123 [22]

Answer:

66

Step-by-step explanation:

Use the formula for the mean of a set of numbers:

                  sum of the numbers

average = --------------------------------

                     count of numbers

Here we know that the average mark was 68, so we can write:

               

                           75 + 62 + 84 + 53 + x

average = 68 = ----------------------------------

                                           5

or                            274 + x

                  68 = -------------------

                                    5

Solving for x, we multiply both sides by 5:     340 = 274 + x.

Subtracting 274 from both sides effectively isolates x:

 340 = 274 + x

- 274    -274

------------------------

  66      =    x

The fifth student's mark was 66.

4 0
3 years ago
Solve the equation 5x+2-x=-4x
AVprozaik [17]
5x + 2 -x = -4x

4x +2 = -4x

2 = -4x -4x

2 = -8x

x = - 1/4


hope this helps
8 0
3 years ago
Read 2 more answers
What is 36:12 as a fraction in lowest terms?
Rom4ik [11]
Did you mean 36/12? If so the answer would be 3/1 or 3.
3 0
3 years ago
Someone please help ASAP. 15 points and I’ll mark brainliest.
lyudmila [28]

Answer:

first is linear second is quadratic and third looks like linear

Step-by-step explanation:

1. its a continuous straight line, linear

2. parabola shaped, quadratic

3. again a straight line, so linear

3 0
3 years ago
What are the roots of a problem (Math)
puteri [66]

The roots, zeros, or solutions (they all means same thing) of an equation are when you graph that equation, x-intercepts are the real roots, zeros, or solutions.

Or set the y equal to zero which does the same job.

6 0
3 years ago
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