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3 years ago

Find the latetal surface area

Mathematics

1 answer:

wariber [46]3 years ago

5 0

Answer:

add

Step-by-step explanation:

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Please help!!

yarga [219]

Because this is a fourth degree that will be tricky to factor as it is, we will do a u substitution. Let $x^2=u$ . We can now rewrite that polynomial in terms of u: $u^2-7u-8=0$ . Filling into the quadratic formula we have $u=\frac{7+/-\sqrt{49-4(1)(-8)}}{2}$ . Simplifying down $u=\frac{7+/-\sqrt{81}}{2}$ and $u=\frac{7+9}{2}$ or $u=\frac{7-9}{2}$ . That means that u = 8 or u = -1. But don't forget that we let $u=x^2$ , so we have to put x-squared back in for u. That gives us $x^2=8$ which simplifies down to $+/-2\sqrt{2}$ . That also gives us $x^2=-1$ . When we take the square root of -1, we have to use the fact that -1 = i^2, so we sub that in to get $x=+/-i$ . All in all, your solutions are as follows: $2\sqrt{2},-2\sqrt{2},i,-i$ which is choice b.

7 0

2 years ago

Estimate the sum 458+214

sertanlavr [38]

672 is the answer to this question

5 0

3 years ago

Read 2 more answers

40 tens.how many hundreds

Sladkaya [172]

400. Just add a zero when you're dealing with tens

7 0

3 years ago

An item is priced at $13.57. If the sales tax is 7%, what does the item cost including sales tax?

cluponka [151]

Answer:

14.52

Step-by-step explanation:

13.57 + 13.57 x 7% = 13.57 x (1+7/100) =13.57 x 107/100 = 14.52

5 0

3 years ago

Which choice is the equation of a line that passes through the point (–6, –2) and is perpendicular to the line represented by th

kobusy [5.1K]

Answer:

B. y = 1/3x

Step-by-step explanation:

The slope of the given line is -3, so the slope of the perpendicular line will be the negative reciprocal of that: -1/(-3) = 1/3. This eliminates choices A and C.

We can find the y-intercept (b) if we use the given point values in the equation ...

y = 1/3x +b

we get ...

-2 = (1/3)(-6) +b

-2 = -2 +b . . . simplify

0 = b . . . . . . . add 2

So, the equation of the perpendicular line through the given point is ...

y = 1/3x . . . . matches choice B

_____

<em>Alternate solution method</em>

You can try the given point in the given equations. You will find that only the equation of choice B will work.

7 0

3 years ago

Find the latetal surface area​

Find the latetal surface area