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2 years ago

10. Lin says that a solution to the equation 2x – 6 = 7x must also be a solution to the

Mathematics

1 answer:

nirvana33 [79]2 years ago

3 0

Answer:

Both give - 6=5x

Step-by-step explanation:

First equation 2x-6=7x

When you solve it, it becomes :

2x-6=7x

Subtract 2x both sides

2x-2x-6=7x-2x=

-6=5x

2)5x-6=10

5x-5x-6=10x-5x

-6=5x

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What is the smallest angle of rotational symmetry for a square

mars1129 [50]

When we rotate a figure and there is no change in the shape of the figure then it has rotational symmetry.

We know that the order of rotation for a square is 4.

Hence, we have $\frac{360}{4} =90^{\circ}$

Thus, the angle of rotational symmetry of square are

$90^{\circ}, 180^{\circ}, 270^{\circ}$

Hence, the minimum angle of rotational symmetry is $90^{\circ}$

Therefore, the minimum angle of rotational symmetry for a square is 90 degrees.

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2 years ago

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Farah rolls a fair dice and flips a fair coin. What is the probability of obtaining a 5 and a head?

Illusion [34]

Answer:

2/3 or 4/6

Step-by-step explanation:

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3 years ago

( Will give Brainliest) Please Helpp<br> Solve the formula for b. Area of rectangle: A=bh

myrzilka [38]

So get b alone.
A=bh
Divide by h
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2 years ago

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A fast food restaurant executive wishes to know how many fast food meals teenagers eat each week. They want to construct a 99% c

Lana71 [14]

Answer:

The minimum sample size required to create the specified confidence interval is 2229.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.99}{2} = 0.005$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.005 = 0.995$ , so $z = 2.575$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

What is the minimum sample size required to create the specified confidence interval

This is n when $M = 0.06, \sigma = 1.1$

$0.06 = 2.575*\frac{1.1}{\sqrt{n}}$

$0.06\sqrt{n} = 2.575*1.1$

$\sqrt{n} = \frac{2.575*1.1}{0.06}$

$(\sqrt{n})^{2} = (\frac{2.575*1.1}{0.06})^{2}$

$n = 2228.6$

Rounding up

The minimum sample size required to create the specified confidence interval is 2229.

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3 years ago

Find the multiplicative inverse of -2 in mod 7<br>

Elis [28]

Answer:

So something mod 7 is -2
Lets consider what mod does as a commands: If you have 7 and then mod it by 2 ie 7%2 you get 1
Essentially mod is seeing how many times a # goes into the other number and finding the remainder.
In this case we want the remainder of 2: -8%3 =-2
note there is also a mathematical procedural way to solve this.
Rate positively and give brainlist

6 0

2 years ago