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2 years ago

Which of the following is the perimeter of a square with a side of 9 cm?

Mathematics

1 answer:

zubka84 [21]2 years ago

5 0

The answer to this question is 36cm.

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Marcos had 15 coins in nickels and quarters. He had 3 more quarters than nickels. He wrote a system of equations to represent th

hodyreva [135]

Answer:

There are 6 coins in nickels and 9 coins in quarters.

Step-by-step explanation:

Now, to find the solution.

According to question:

The number of nickels = $x$ .

The number of quarters = $y.$

So, the total number of coins:

$x+y=15.$

He had 3 more quarters than nickels.

Thus,

$y=x+3$ .....(1)

Now, to get the solution:

$x+y=15$

Substituting the equation (1):

$x+(x+3)=15$

$x+x+3=15$

$2x+3=15$

Subtracting both sides by 3 we get:

$2x=12$

Dividing both sides by 2 we get:

$x=6.$

The number of nickels = 6.

Now, substituting the value of $x$ in equation (1):

$y=x+3\\\\y=6+3\\\\y=9.$

The number of quarters = 9.

Thus, there are 6 coins in nickels and 9 coins in quarters.

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3 years ago

Someone please help with this,I’m no expert at doing annotated bibliography I will give Brainliest to whoever helps me out(:

Nitella [24]

An annotated bibliography includes the citation and a brief description of the source.

The citation can be made by plugging in information in an online citation website.

The description is 2 to 3 sentences about what type of source (primary or secondary) and how you used it (for the images, background info, etc).

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2 years ago

What are the solution of x^2-2x+17=0

ddd [48]

Answer:

Step-by-step explanation:

$x^2-2x+17=0\qquad\text{subtract 17 from both sides}\\\\x^2-2x=-17\\\\x^2-2(x)(1)=-17\qquad\text{add}\ 1^2\ \text{to both sides}\\\\x^2-2(x)(1)+1^2=-17+1^2\qquad\text{use}\ (a-b)^2=a^2-2ab+b^2\\\\(x-1)^2=-17+1\\\\(x-1)^2=-16$

$x-1=-4i\ \vee\ x-1=4i\qquad\text{add 1 to both sides}\\\\x=1-4i\ \vee\ x=1+4i$

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2 years ago

Which of the following shapes is

adelina 88 [10]

Answer:

D, Circle

Step-by-step explanation:

All the other shapes are 3D and have a volume.

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2 years ago

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2 years ago