PLEASE SOLVE Solve for x if x+9=7

Mathematics

1 answer:

guajiro [1.7K]2 years ago

5 0

Answer:

-2 is the correct answer

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Hi ! How to solve this question?

tester [92]

You should actually have

$-x^2-4x-10=-(x^2+4x+10)=-(x^2+4x+4+6)=-((x+2)^2+6)=-(x+2)^2-6$

Now, remember that $x^2$ is always non-negative, so $(x+2)^2\ge0$ for any value of $x$ . This means $-(x+2)^2\le0$ for any $x$ , and so

$-(x+2)^2-6\le0-6=-6$

i.e. f(x) is at most -6, and hence negative for all $x$ .

4 0

3 years ago

Find the sale price

Nimfa-mama [501]

24.5x.18=4.41

$4.41 is how much you save with the discount. You subtract this amount from the regular price.

24.5-4.41=20.09

The sale price of the item should be $20.09

3 0

2 years ago

An apartment building has the

KatRina [158]

Answer:

8/17

Step-by-step explanation:

3 0

2 years ago

A simple random sample of size n is drawn from a normally distributed population, and the mean of the sample is (x with a line o

prohojiy [21]

Answer:

Last option

${\overline {x}}} \± \frac{2.58*s}{\sqrt{n}$

Step-by-step explanation:

${\overline {x}}$

If we extract a sample of size n from a normal population and we want to estimate the population mean then the confidence interval for the mean will be:

${\overline {x}}} \± Z_{\alpha/ 2}*\frac{s}{\sqrt{n}$