2 years ago

Write a formula for this sequence: 8,-1,-10,-19

1 answer:

4 0

This is an arith. sequence, and the common difference is -9.

a(n+1) = a(n)-9, with a(1)=8. Thus, if we look at the first term, we see 8; subracting 9 from 8 produces the second term (-1).

You might be interested in

2. Given that the radius of the Earth is 6340 Km. calculate the Surface Acer of earth

serious [3.7K]

Answer:

Step-by-step explanation:

The surface area of a sphere (which the earth is considered to be) = 4 pi r^2

pi = 3.14

r = 6340

Area = 4 * 3.14 * 6340 * 6340 = 504856736 square km.

You should either round this to 505,000,000 or express a value in scientific notation.

5.05 * 10^8

6 0

2 years ago

Find the y-intercept of the following equation. Simplify your answer.

jarptica [38.1K]

The y intercept is going to be 10x

4 0

2 years ago

Read 2 more answers

Lucy wants to be exempt from her semester exam. In order for that to happen, she has to average an 85 over 3 test grades. Her fi

anastassius [24]

Answer:

Grades to be scored in 3rd exam = 88

Step-by-step explanation:

Given that average of 3 numbers is 85.

First two numbers are 81 and 86.

To find:

3rd number so that average is 85

Solution:

Let the third number = $x$

Formula for average is:

$Average = \dfrac{Sum\ of\ numbers}{Total\ count\ of\ numbers}$

Here, sum of numbers = $81+86+x =167+x$

Total count of numbers = 3

$85 = \dfrac{167+x}{3}\\\Rightarrow x=255-167\\\Rightarrow \bold{x=88}$

Grades to be scored in 3rd exam = 88

8 0

2 years ago

Find the perimeter and area of a rectangle of cardboard measuring 15.9 cm by 11.7cm

IRISSAK [1]

The area is 186.03. lw = 15.9(11.7) = 186.03

4 0

2 years ago

Find the radius of the circle. Leave your answer in simplest radical form.

dangina [55]

44 that is probably the answer since it's half

7 0

2 years ago