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3 years ago

Humans breathe about 15 breaths in a minute. The average

Mathematics

1 answer:

NeX [460]3 years ago

7 0

Answer:

Humans breathe about 300 liters of air in 25 minutes

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X - 14 = 13 What value of x makes this equation true

zheka24 [161]

Answer:

Step-by-step explanation:

3 0

3 years ago

Solve this problem out

Virty [35]

Option C

When $(2x - 3)^2$ is subtracted from $5x^2$ then the result is $x^2 + 12x - 9$

<h3>Solution:</h3>

Given that $(2x - 3)^2$ is subtracted from $5x^2$

We have to find the result

Subtraction is a mathematical operation that tells us the difference between two numbers.

When "a" is subtracted from "b", we write in mathematical expression as "b - a"

So $(2x - 3)^2$ is subtracted from $5x^2$ is written mathematically as:

$\rightarrow 5x^2 - (2x - 3)^2$

Expanding the above expression using algebraic identity:

$(a-b)^2 = a^2 - 2ab + b^2$

$\rightarrow 5x^2 - ((2x)^2 -2(2x)(3) + (3)^2)\\\\\rightarrow 5x^2 - (4x^2 - 12x + 9)$

Multiplying the nnegative sign with terms inside bracket

There are two simple rules to remember:

When you multiply a negative number by a positive number then the product is always negative.

When you multiply two negative numbers or two positive numbers then the product is always positive.

$\rightarrow 5x^2 - (4x^2 - 12x + 9)\\\\\rightarrow 5x^2 - 4x^2 + 12x -9\\\\\rightarrow x^2 + 12x - 9$

Hence the result is: $x^2 + 12x - 9$

3 0

3 years ago

I need help if right I will mark you as brainlest

Alex Ar [27]

Answer:

If your install bratleby on your device, It will help you with this. But you will have to put in an email. and it will give 10 questions to answer for free. Sorry that I cannot help you with this.

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

Hayden bought 48 new trading cards. Three fourths are baseball cards. How many baseball cards Hayden buy?

schepotkina [342]

36 cards.....

48 3 144
---- * ----- = ------ = 36
1 4 4

36 baseball cards

8 0

3 years ago

Y= 2x - 1 , y - x = 4

Aleks04 [339]

Answer:

x=5 and y=9

Step-by-step explanation:

Sub 1 into 2

2x-1 - x = 4

x= 4+1

x= 5

y= 2(5)-1

y= 10-1

y= 9

7 0

3 years ago