Ask question

Ask question

All categories

3 years ago

9

I need help with this, no matter how hard I do, I don't get the answer. 3 [ 10 ( 16 - 6 + 3 ) ] I don't know what the answer is.

1 answer:

sweet-ann [11.9K]3 years ago

7 0

the answer is 390

Step-by-step explanation:

don't ask how

You might be interested in

Which is the following is the set of real zeros of the function f(x) = (x3 + 1000)(x4 - 160,000)?

marusya05 [52]

Answer:

A. { -20, -10, 20 }

Step-by-step explanation:

Given:

The function is given as:

$f(x)=(x^3+1000)(x^4-160000)$

Let us simplify the function.

First, we use the identity $a^3+b^3=(a+b)(a^2-ab+b^2)$

$x^2+1000= x^3+10^3=(x+10)(x^2-10x+10^2)\\x^3+1000=(x+10)(x^2-10x+100)$

Next, we use the identity $a^4-b^4=(a-b)(a+b)(a^2+b^2)$

$x^4-160000=x^4-20^4=(x-20)(x+20)(x^2+20^2)=(x-20)(x+20)(x^2+400)$

Now, the function can be rewritten as:

$f(x)=(x+10)(x^2-10x+100)(x-20)(x+20)(x^2+400)$

Now, the zeros are those values of $x$ for which $f(x)=0$

Now, for $f(x)=0$ , we must have either of the factors 0.

$x+10=0\\x=-10$

$x-20=0\\x=20\\\\x+20=0\\x=-20$

The factors $x^2-10x+100$ and $x^2+400$ can have no zeros as the first one has imaginary roots and second one is always greater than 0 irrespective of the $x$ values.

So, the possible set of zeros are { -20, 10, 20 }.

6 0

4 years ago

Who knows how to do this

Ivan

Area by Heron's formula:
semiperimeter = (15 + 20 + 25)/2 = 60/2 = 30 cm
$
Area = \sqrt{30(30-15)(30-20)(30-25)}= \sqrt{30 \cdot5\cdot10\cdot15}= \\\\ {} \ \ \ \ \ \ =\sqrt{22500} =150 \ cm^2$

The formula of the area of a triangle: Area = 1/2 * base * height
1/2 * 25 * height = 150
12.5 * height = 150
height = 150/12.5
height = 12 cm

3 0

3 years ago

Carol surveyed two samples of 200 people each about their favorite musical instrument and recorded them in the table below.

Tcecarenko [31]

Answer:

$\%Guitar = 33 \%$

Step-by-step explanation:

Given

The two-way table

Required

Percentage of men and women whose favorite is Guitar

From the table, we have:

$Total = 200$

Those who prefer Guitar

$Men=29$

$Women = 37$

So:

$Guitar = 29 +37 = 66$

So, the percentage of men and women is:

$\%Guitar = \frac{Guitar}{Total} * 100\%$

$\%Guitar = \frac{66}{200} * 100\%$

$\%Guitar = \frac{6600}{200} \%$

$\%Guitar = 33 \%$

5 0

3 years ago

A 152-inch board s cut into two pieces. one piece is three times the lenght of the other. Find the lenght of the shorter piece.

Ronch [10]

Answer:

19

Step-by-step explanation:

152 divided by 2 is 76

76/4 is 19

3 0

3 years ago

Ashlynn played six rounds of golf. Her scores were 72.79,74,76,76, and 75. She really wants to have an mean of 75 after her next

Zolol [24]

Well, suppose she gets x points in 7th round. Then she wants mean to be 75, meaning

(72+79+74+76+76+75+x)/7=75

Can you find x from here?

4 0

3 years ago