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2 years ago

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Mathematics

1 answer:

marissa [1.9K]2 years ago

7 0

Answer:

2 and 3

Step-by-step explanation:

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Problem Solving If seven coins add to $1, what could the coins be?

Alchen [17]

Answer:

2 quarters and 5 dimes

Step-by-step explanation:

(2) 25 cent coins = 50 cents

(5) 10 cent coins = 50 cents

equals $1

4 0

3 years ago

7^2•3^2+(1+2)^0•3-4^2•1

Kamila [148]

7^2•3^2+(1+2)^0•3-4^2•1
= 49•9 + 1•3 - 16•1
= 441 + 3 - 16
= 428

6 0

3 years ago

The length of the rectangle is x cm. The length of a diagonal of the rectangle is 8 crn. The perimeter of the rectangle is 20 cm

klemol [59]

Answer:

$x^2-10x+18=0$

a = -10 and b = 18.

Step-by-step explanation:

Let w represent the width of the rectangle.

We are given that the perimeter of the rectangle is 20 cm, this means that:

$20=2(x + w)$

Let's put w in terms of x. Divide both sides by two:

$10=x+w$

And solve for w:

$w=10-x$

So, the rectangle measures x by (10 - x) cm.

According to the Pythagorean Theorem:

$a^2+b^2=c^2$

a and b are the legs and c is the hypotenuse.

Substitute x for a, w for b, and 8 for c:

$x^2+w^2=8^2$

Simplify and substitute:

$x^2+(10-x)^2=64$

Square:

$x^2+(100-20x+x^2)=64$

Isolate the equation. So:

$2x^2-20x+36=0$

Since the leading coefficient is one, divide both sides by two:

$x^2-10x+18=0$

Therefore, a = -10 and b = 18.

6 0

2 years ago

0.0002077 in Scientific notation

Aloiza [94]

Answer: 2.077x10^-4

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

Examine this system of equations. Which numbers can be multiplied by each equation so that when the two equations are added toge

aleksklad [387]

Answer:

The first equation must be multiplied by 18 and second equation must be multiplied by 8

Step-by-step explanation:

8 0

2 years ago