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4 years ago

5 language books, 6 math books. in how many ways can one math book and one language book be paired?

1 answer:

5 0

Subtract 6 and 5. The result will be 1, which will remove 1 book to which has more numbers. 6 Math books, you take one and they are 55 language books5 books of mathematics.If in the problem tells you that you should not remove any book ... well idk lol

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What restrictions is there with a square root expression?

iris [78.8K]

There is one restriction: The number whose square root is needed can not be negative

8 0

3 years ago

If the cost of an item increased by a percentage and decreased by the same percentage, what would that percentage be if the new

Orlov [11]

The percentage, if the new cost was 84% of the original is 40%

Let the cost of the item be x.

When the price increased by y%, the new price is:

$New =x \times (1 + y\%)$

When the price decreased by the same percentage (i.e. y%), the new price is:

$New =x \times (1 + y\%) \times (1 - y\%)$

The cost is said to be 84% of the original price.

So, we have:

$x \times (1 + y\%) \times (1 - y\%) =84\% \times x$

Divide both sides by x

$(1 + y\%) \times (1 - y\%) =84\%$

Apply the difference of two squares

$1 - (y\%)^2 =84\% \\\\$

Subtract 1 from both sides of the equation

$- (y\%)^2 =-16\%$

Cancel out the common factors

$(y\%)^2 =16\%$

Take the square root of both sides

$y\% =0.4$

Multiply both sides by 100

$y =40$

Hence, the percentage is 40%

Read more about percentage change at:

brainly.com/question/809966

8 0

3 years ago

Will give brainiest if correct

amm1812

If a=c and b=c then a=c this is transitive property

4 0

3 years ago

Read 2 more answers

Simplify X to the power of 7/3 over X to the power of 2/3

sukhopar [10]

Answer:X to the power of 3.

Step-by-step explanation:

Using one of laws of indices..The two entities have the same bases which is X, so all we have to do is to add their powers. Adding 7/3 and 2/3 gives 3.

3 0

3 years ago

2. A surveyor measures the distance across a river that flows straight north by the following method. Starting directly across f

IgorLugansk [536]

Answer:

The wide is 70.02 m.

Step-by-step explanation:

First you need to draw a triangle with only one 90 degrees angle.

The opposite side to the 90 degrees angle will be the hypotenuse.

We will call the remaining sides ''Baseline'' and ''River wide''.

The angle between hypotenuse and baseline is 35 degrees.

The triangle has one 90 degrees angle so we can apply the tangent equation

in the angles that are no 90 degrees.

Tangent (angle) = Opposite side/adjacent

Tan(35°)= River wide/100m

River wide = 100m.Tan(35°)

River wide = 70.02 m

6 0

4 years ago