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2 years ago

Please help me, I don't know the difference between an expression and an equation. XD

Mathematics

1 answer:

DiKsa [7]2 years ago

4 0

Step-by-step explanation:

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A line tangent to a circle and a radius of the same circle intersect at the point of tangency to create an angle of what measure

aliya0001 [1]

A theorem states that, given a circle with center C and a point P on the circumference, the tangent line through P and the radius CP are perpendicular.

So, the answer is 90 degrees.

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3 years ago

1) Twice a number decreased by four is 32.<br> What is the number?

jeyben [28]

Answer:

Step-by-step explanation:

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3 years ago

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Find the absolute value and the opposite of the integer.

Talja [164]

The absolute value is always non-negative!

So the absolute value of 57 is 57 itself, as it's non-negative (i.e. it's positive or 0).

Opposite value is the number with a different sign: an opposite value of a positive number is negative, so here it will be -57 .

The correct answer is C.

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3 years ago

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Kathy is fencing in her yard that has an area of 800 square feet. Her yard is in the shape of a rectangle where the length is 60

anygoal [31]

Answer:

The dimensions of the yard are W=20ft and L=40ft.

Step-by-step explanation:

Let be:

W: width of the yard.

L:length.

Now, we can write the equation of that relates length and width:

$L=5W-60$ (Equation #1)

The area of the yard can be expressed as (using equation #1 into #2):

$Area=W*L=W*(5W-60)$ (Equation #2)

Since the Area of the yard is $800 ft^2$ , then equation #2 turns into:

$800=W*(5W-60)$

Now, we rearrange this equation:

$800=W*(5W-60)//800=5W^2-60W//5W^2-60W-800=0$

We can divide the equation by 5 :

$W^2-12W-160=0$

We need to find the solution for this quadratic. Let's find the factors of 160 that multiplied yields -160 and added yields -12. Let's choose -20 and 8, since $(-20)*8=160$ and $-20+8=-12$ . The equation factorised looks like this:

$(W-20)(W+8)=0$

Therefore the possible solutions are W=20 and W=-8. We discard W=-8 since width must be a positive number. To find the length, we substitute the value of W in equation #1:

$5*20-60=40$

Therefore, the dimensions of the yard are W=20ft and L=40ft.

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3 years ago

Which graph represents y as a function of x?

Lubov Fominskaja [6]

Answer:

Step-by-step explanation:

By vertical line test, if you draw any vertical line, except for A, all graph meet at more than two points. So, graph A represents y as a function of x.

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3 years ago