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Bond [772]
3 years ago
11

What happens when y = -f(-x)?

Mathematics
1 answer:
IgorLugansk [536]3 years ago
3 0

Answer:

It's a reflection over the x axis.

Step-by-step explanation:

Idk I googled it.

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You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you beli
zhuklara [117]

Answer:

We need to sample at least 1069 parents.

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{1-0.9}{2} = 0.05

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 1-0.05 = 0.95, so z = 1.645

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.

How many parents do you have to sample?

We need to sample at least n parents.

n is found when M = 4, \sigma = 79.5. So

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

4 = 1.645*\frac{79.5}{\sqrt{n}}

4\sqrt{n} = 1.645*79.5

\sqrt{n} = \frac{1.645*79.5}{4}

(\sqrt{n})^{2} = (\frac{1.645*79.5}{4})^{2}

n = 1068.92

Rounding up

We need to sample at least 1069 parents.

6 0
3 years ago
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PLSSS HELP WITH THIS ONE !!! MARKING AGAIN THE BRAINLIST ANSWER!!!
Levart [38]

Answer:

Step-by-step explanation:

He earned $15.20. Just multiply the 2.00x4 and the 2.40x3

3 0
3 years ago
Suppose your friend is having trouble solving the inequality -2(3x-8)<5(4-x). Show each step you would take to solve the ineq
Molodets [167]
Your answer will be x > <span>−<span>4</span></span>
7 0
3 years ago
Thethree sides of a triangle measure 810 and 12 units is this a right angle?
Alja [10]

Answer:

The given triangle is NOT A RIGHT ANGLED TRIANGLE.

Step-by-step explanation:

Here, the three given sides of the triangle are:

8 units, 10 units and 12 units

Now, for any triangle to be a right angle:

by the PYTHAGORAS THEOREM:

(Base)^2 + (Perpendicular)^2  = (Hypotenuse)^2

The longest of all sides id the hypotenuse.

⇒ H  = 12 units

Let us assume, B = 8 units, P = 10 units

Now, here checking the condition:

(8)^2  + (10)^2  = 64  + 100  = 164  \neq (12)^2  = 144\\\implies (B)^2  + (P)^2  \neq (H)^2

Hence, the given triangle is NOT A RIGHT ANGLED TRIANGLE.

4 0
4 years ago
I NEED AN EXPERT ON SURFACE AREAS..Ill give extra points and brainless​
natta225 [31]

Answer:

60 is the area

Step-by-step explanation:

you just mult 12x5

7 0
3 years ago
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