All categories

2 years ago

Find the common difference for the arithmetic sequence. 1.7, 2.7, 3.7 4.7.....

Mathematics

1 answer:

Anni [7]2 years ago

5 0

Answer:

Step-by-step explanation:

You do not need to where the formula comes from but, just for fun, here’s a hint

To add up the numbers 1 to 10

Write out the numbers

1 2 3 4 5 6 7 8 9 10

Write them backwards

10 9 8 7 6 5 4 3 2 1

Add up both lists

11 11 11 11 11 11 11 11 11 11

This is 10 × 11 = 110

But this is twice the sum as two lots were added together

So the sum of the numbers 1 to 10 is 110 ÷ 2 = 55

ArSeqSum Notes fig4, downloadable IGCSE & GCSE Maths revision notes

You might be interested in

What is 2(x+14)+(2x-14

lawyer [7]

2x+28+2x-14
————————
4x+14

5 0

2 years ago

I already solved this but I'm confused if the answer is A or C?

irinina [24]

The answer is C. a 4.5 feet, b. 30 feet

8 0

1 year ago

Read 2 more answers

(24xy^3-16x^2y^2+32x^2y)/8xy

Ahat [919]

(24xy^3-16x^2y^2+32x^2y)/8xy

(‌24xy^3−16x^2y^2+32x^2y8‌x)(y) =−2x^3y^3+3x^2y^4+4x^3y^2

4 0

3 years ago

The intersection of two planes can be a point true or false

sergij07 [2.7K]

Answer:

true

Step-by-step explanation:

4 0

2 years ago

Read 2 more answers

A The length of a rectangle is 4 m more

Lady bird [3.3K]

Given :

The length of a rectangle is 4m more than the width.
The area of the rectangle is 45m²

⠀

To Find :

The length and width of the rectangle.

⠀

Solution :

We know that,

$\qquad { \pmb{ \bf{Length \times Width = Area_{(rectangle)}}}}\:$

So,

Let's assume the length of the rectangle as x and the width will be (x – 4).

⠀

Now, Substituting the given values in the formula :

$\qquad \sf \: { \dashrightarrow x \times (x - 4) = 45 }$

$\qquad \sf \: { \dashrightarrow {x}^{2} - 4x = 45 }$

$\qquad \sf \: { \dashrightarrow {x}^{2} - 4x - 45 = 0 }$

$\qquad \sf \: { \dashrightarrow {x}^{2} - 9x+ 5 x - 45 = 0 }$

$\qquad \sf \: { \dashrightarrow x(x - 9) + 5(x - 9) = 0 }$

$\qquad \sf \: { \dashrightarrow (x - 9) (x + 5) = 0 }$

$\qquad \sf \: { \dashrightarrow x = 9, \: \: x = - 5}$

⠀

Since, The length can't be negative, so the length will be 9 which is positive.

⠀

$\qquad { \pmb{ \bf{ Length _{(rectangle)} = 9\:m}}}\:$

$\qquad { \pmb{ \bf{ Width _{(rectangle)} = 9 - 4=5\: m}}}\:$

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

8 0

1 year ago