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charle [14.2K]
3 years ago
6

What is the first step in solving 2x=y X+y=30

Mathematics
1 answer:
Vanyuwa [196]3 years ago
8 0

Answer: x = 10 y=20

Step-by-step explanation:

You can answer this question by plugging in each equation:

2x=y, x+y=30. Let us plug y as 2x in the second equation x+y=30

x+2x= 30

3x= 30

x=10

After we found x we can then find y by plugging the 10 for x.

2(10) = y

y =20

or you could plug in the other equation

10+y=30

subtract 10 from 30 and we get 20

to double check we can plug in both numbers

2(10) = 20 which is correct

and 10 + 20 = 30 which is correct

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A normal distribution has a mean of 10 and a standard deviation of 1. What is the probability of selecting a number that is at m
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Let x be a random variable that represents numbers .

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P(x\leq10)=P(\dfrac{x-\mu}{\sigma}\leq\dfrac{10-10}{1})\\\\=P(z\leq0)=0.500

As the area occupied by standard normal curve less than equal to 0 = 0.500

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2 years ago
Triangle DEF is similar to triangle D'E'F'.Triangle D E F is rotated about point F and is shrunk to form triangle D prime E prim
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Answer:

The answer is "Rotation and dilation".

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6 0
3 years ago
Read 2 more answers
For t > 30, L(t), the linear approximation to A at t = 30, is a better model for the amount of grass clippings remaining in t
lina2011 [118]

Answer:

35 days

Step-by-step explanation:

We know that L(t) is the tangent to the line A(t) at t = 30

At t = 30:

A (30) ≈ 0.783 →(30, 0.783) = (t, A(t))

A¹ (30) ≈ -0.56

let -0.56 = M

For a linear function, a straight line equation applies which leads to

(y-y₁) = m (x-x₁)                                                   ...1

So for this problem we have;

A (t)-0.783 = -0.56 (t - 30)

when there is 0.5 pounds of grass, A (t) - 0.5, then using the equation (1)

(0.5 - 0.783) = -0.56 (t-30)

                   t = 35.054

                     ≈ 35 days

3 0
3 years ago
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