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galben [10]
3 years ago
8

Evaluate the expression below if x=-1 and y=3. 3x²-y²

Mathematics
2 answers:
svlad2 [7]3 years ago
8 0
The answer is -12 I believe
Dmitry [639]3 years ago
7 0

Answer:

-6

Step-by-step explanation:

3x² - y²

plug in x and y

3(-1)² - (3)²

according to PEMDAS, solve the exponents first.

3(1) - 9

multiply

3 - 9

subtract

= -6

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If a is directly proportional to b/2 and a=1 when b=10, what is the value of a when b=35
iris [78.8K]
The value of a would be 3.5, as a=1 when b=10 means that a is worth 1/10 of b's value. 
5 0
3 years ago
I need answer please​
zhenek [66]

Answer:

We know that lines <em>l</em><em> </em>and <em>m</em><em> </em>are parallel. The alternate interior angles rule states that the alternate interior angles formed by parallel lines are equal. So let's equate them.

2x + 22 = 4x

putting variables on one side,

22 = 4x - 2x

Thus 2x = 22

x becomes 22÷2

Therefore,<u> x = 11.</u>

pls give brainliest for the answer

8 0
2 years ago
A rectangular field is 90 yards long and 60 yards wide.Give the length and width of another rectangular field that has the same
Ilya [14]

Answer:

The length and width of another rectangular field with same perimeter but a larger area is 80 m by 70 m

Step-by-step explanation:

The perimeter of the existing field is

2(l + b)

= 2(90 + 60) = 2(150) = 300 yards

So we want another field having the same perimeter but a larger area

The area we have here is 90 * 60 = 5,400 square yards

If we had 80 by 70

Perimeter will still be 2(70 + 80) = 150

But the area will be 80 * 70 = 5,600 square yards

3 0
3 years ago
Which equation best represents the relationship between x, the age of the machine in years, and y, the value of the machine in d
Evgen [1.6K]

Answer:

y=-0.5x+8

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8 0
2 years ago
Which measure is of an angle that is conterminal with a 95 degree angle
timofeeve [1]

Answer: Choice B

95 - 1080n for any integer n

=================================================

Explanation:

Notice how 1080 is a multiple of 360 since 360*3 = 1080. The other values 1450, 780 and 340 are not multiples of 360. For example 1450/360 = 4.02777 approximately. We need a whole number result to show it is a multiple.

Therefore, choice B shows subtracting off a multiple of 360 from the original angle 95. In my opinion, it would be better to write 95+360n or 95-360n to make it more clear we are adding or subtracting multiples of 360.

Choice B will find coterminal angles, but there will be missing gaps. One missing coterminal angle is 95-360 = -265 degrees. So again, 95-360n is a more complete picture. I can see what your teacher is going for though.

8 0
3 years ago
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