Write a rule for the nth term of the sequence. Then find a20. Assume the first termis a₁. 86, 79, 72, 65…

Mathematics

1 answer:

hodyreva [135]2 years ago

5 0

Answer:

an = a(n-1) - 7

Step-by-step explanation:

the second term is smaller than the first term 7.

a20 = a19 - 7

a19 = a18 - 7

=> a20 = (a18 - 7) - 7

Then you can accumalate until a1

-> a20 = a1 - 19*7 = 86 - 19*7 = -47

You might be interested in

Shannon is planning to tile a rectangular kitchen countertop that is 24 inches wide and 64 inches long. She determined that 1 ti

kow [346]

Answer:

Step-by-step explanation:

$\frac{24*64}{4*4}=96\\$

$\frac{24}{4}=6, \frac{64}{4}=16\\6*16=96$

7 0

2 years ago

Find the solutions to the system; y=x^2-3x-1 and y=8x-1

PSYCHO15rus [73]

${x}^{2} - 3x - 1 = 8x - 1 \\ {x}^{2} - 11x = 0 \\ x(x - 11) \\ x = 0 \: or \: x = 11$

When x = 0,
$y = 8x - 1 \\ y = 0 - 1 \\ y = - 1$

When x = 11
$y = 8(11) - 1 \\ y = 87$
x = 0, y = - 1
x = 11, y = 87

Answer is B.

Hope this helps. - M

8 0

2 years ago

What is the median of the following list of numbers?

Novay_Z [31]

Answer:

The answer is 11.

Step-by-step explanation:

First, you put all of the numbers in order, from 7 - 19.

You find the median. You should get 11 and 11.

You add the numbers up to get 22 and divide by 2.

5 0

2 years ago

Convert the following into standard form <br><br> y = -x + 1/3

Doss [256]

y = -x + 1/3
+ x + x
--------------------------
x + y = 1/3

5 0

2 years ago

A cell phone company $500 for a new phone and $60 for a monthly plan. If C(t) is a rational function that represents the average

lisov135 [29]

The range of a function is the set of possible values that can be obtained from the dependent variable. The range of the function is: $R: (500, \infty)$