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3 years ago

What is the square root of -9 in simplest form

Mathematics

2 answers:

puteri [66]3 years ago

8 0

Answer:

Step-by-step explanation:

Square root -9

√(-9) = (3i)(3i)

Note that the "imaginary number" is a non-existent number. Note that in the rules of imaginary numbers: i * i = i² = -1

matrenka [14]3 years ago

4 0

It is 3i.
The square root of -9 is the square root of -1 times the square root of 9.
So: the square root of 9 is 3, and the square root of -1 is called i (this doesn't actually exist, it's just imaginary).
Then, the square root of -9 is 3i.

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The number of boys in a school is 120% the number of girls at the school. Find the number

KiRa [710]

Answer:

66 girls

Step-by-step explanation:

Givens:

●120% boys of girls

▪︎1.2 × g

☆when g is the number of girls

●80 boys

▪︎meaning you can set up a proportion

Solving:

g × 1.2 = 80

g=80/1.2

g=66.66

So, since you can't go over percent, the answer is 66.

Checking:

g × 1.2 = 80

66 × 1.2 = 80

80=80✅

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3 years ago

Clint wants to keep a young tree from blowing over during a high wind.he decides that he should tie a rope around the tree at a

liraira [26]

The rope tied to the tree will make a triangle.

The height of the triangle = 180cm
The base of the triangle = 200cm

to find how much rope you need, work out the hypotenuse using Pythagoras:

180^2 + 200^2 = 72400
√72400 = 269.0724809

This is the length of rope he needs, however you need to +30 as this is what he will need when he ties the rope:

269.0724809 + 30 = 299.0724809

299.0724809 is less than the 270cm of rope he has, so he would need more.

8 0

3 years ago

Represent the following sentence as an algebraic expression, where "a number" is the

BaLLatris [955]

Answer:

2 * (x - 3)

Step-by-step explanation:

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2 years ago

find an equations for the lines through the point (2,1) which is perpendicular to the line with equation y+4x=7

daser333 [38]

Hope this helps you!

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3 years ago

The compound periods multiplied by the number of years is 4t. The initial number of cars serviced is 920. The growth factor is r

Mrac [35]

The number of compounding per year is $N = 920(1+0.03)^4t$

<h3>How can the number of compounding per year be calculated?</h3>

This can be calculated by making use of the formular; 920(1.03)^4t and use the compound interest equation which is N=P( 1+r/n)^nt

We know that 12% was given as the rate per year, then to get the quarter rate we divide by factor of 4, which is 12/4= 3%

The compounding for t years = n*t = 4t where n=4.

and the Initial number of cars serviced=920

Then we can substitute the values into the above equation, we have Thus $N = 920(1+0.03)^4t$

Learn more about compound interest at:

brainly.com/question/13023589

#SPJ1

CHECK THE COMPLETE QUESTION BELOW:

Drag the tiles to the boxes to form correct pairs. Not all tiles will be used. A car repair center services 920 cars in 2012. The number of cars serviced increases quarterly at a rate of 12% per year after 2012. Create an exponential expression to model the number of cars serviced after t years. Then, match each part of the exponential expression to what it represents in the context of the situation. 920(1.03) is the number of cars multiplied by 1.03. The quarterly rate of growth is 0.03 or 3%. The compound periods multiplied by the number of years is 4t. The initial number of cars serviced is 920. The growth factor is represented by 1.03. The growth rate is 1.03. Exponent arrowRight Base arrowRight Coefficient arrowRight Rate arrowRight

7 0

2 years ago