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3 years ago

The price of a book rises from £16 to £20 work out the percentage increase

Mathematics

1 answer:

Vladimir79 [104]3 years ago

5 0

Answer:

25%

Step-by-step explanation:

20-16=4

16…4

1 … 4/16

100…4/16×100

1/4×100

25%

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Please answer the two questions.

Anarel [89]

Answer:

1. n= 14

2. n=3

Step-by-step explanation:

For the first problem, let's break down the equation. The number being thought about can be represented by n. Then n is increased by 7, or simply put 7+ n. The sum is 21, so to find n you can use the equation 7 + n = 24 and solve for n, which is 14.

For problem two, the same strategy can be used. The number is n, multiplied by 9. So, 9 * n is equal to 27. Solve for n by isolating n, and the answer is 3.

6 0

3 years ago

Read 2 more answers

If <img src="https://tex.z-dn.net/?f=x-12%5Csqrt%7Bx%7D%20%2B36%3D0" id="TexFormula1" title="x-12\sqrt{x} +36=0" alt="x-12\sqrt{

Elis [28]

Answer:

x = 36

Step-by-step explanation:

$x - 12\sqrt{x} + 36 = 0$

Subtract x and 36 from both sides.

$-12\sqrt{x} = -x - 36$

Divide both sides by -1.

$12\sqrt{x} = x + 36$

Square both sides.

$144x = x^2 + 72x + 1296$

Subtract 144x from both sides.

$0 = x^2 - 72x + 1296$

Factor the right side.

$0 = (x - 36)^2$

$x - 36 = 0$

$x = 36$

Since the solution of the equation involved squaring both sides, we musty check the answer for possible extraneous solutions.

Check x = 36:

$x - 12\sqrt{x} + 36 = 0$

$36 - 12\sqrt{36} + 36 = 0$

$36 - 12\times 6 + 36 = 0$

$36 - 72 + 36 = 0$

$0 = 0$

Since 0 = 0 is a true statement, the solution x = 36 is a valid solution.

6 0

3 years ago

What is the area of the 50ft by 100ft yard?

mario62 [17]

Answer: 4410 $ft^2$

Step-by-step explanation:

To find the area of a square or rectangle, all you need to do is multiply the length times the width:

L × W = A

The lengh is 100, and the width is 50

100 × 50 = 5000

However, in this problem, we also have other shapes in the rectangle. To find the area of JUST the green, we need to subtract the areas of the two circles and small blue rectangle.

First, let's get the two circles over with. To find the area of a circle, use this formula:

A = π $r^2$ r is the radius, which in this case, is 6

A = π $6^2$

A = 113 This isn't the exact answer, the exact answer would be 113.0973...

Now let's multiply the area of one of those circles by 2, since we have 2 circles:

113 × 2 = 226

Finally, we have to find the area of the blue rectangle. This is simple, just use the formula from the very beginning:

26 × 14 = 364

The last thing to do is to subtract the areas of the two circles and blue rectangle from the area of the entire thing:

5000 - (226 + 364) = 4410 $ft^2$

4 0

3 years ago

Read 2 more answers

Give an example of two numbers that both have six digits, it the greater number is determined by the hundreds place.

spayn [35]

Answer:

565,463 and 565,863

Step-by-step explanation:

7 0

3 years ago

What is six minus negative two x?

GalinKa [24]

Answer:

Therefore the Expression will be.

$6-(-2x)$

$6+2x$ ...As minus - minus sign becomes plus.

Step-by-step explanation:

What is six minus negative two x?

Solution:

It is the Algebraic Expression in Statement form.

Algebraic Expression is given in the form numbers and variables with the operands such as

' + ' Plus Sign
' - ' Minus Sign
' × ' Multiplication Sign
' ÷ ' Division Sign, etc.

Hence Our Statement is " six minus negative two x "

i.e. Number 6 minus sign then again a minus sign of 2x.

Therefore the Expression will be.

$6-(-2x)$

Also equals

$6+2x$ ...As minus - minus sign becomes plus.

5 0

3 years ago

The price of a book rises from £16 to £20 work out the percentage increase​

The price of a book rises from £16 to £20 work out the percentage increase