Needing help with writing correct answer for this question

Mathematics

1 answer:

damaskus [11]3 years ago

3 0

This is your correct question for it Jamie

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How do you get 144 for surface area

ExtremeBDS [4]

Answer:

π = 3.142. π (pi) is the ratio of the diameter to the circumference of a circle. ...

144 = 12" x 12" = the number of square inches in 1 square foot. The math is easier if you measure everything in inches and divide the final answer by 144 to find the number of square feet.

5 0

3 years ago

The cashier has been directed to sell an item for half off its regular price of$1.98.what is the sale price

galben [10]

$1.98 divided by 2 is $0.99
So the sale price is $0.99

4 0

3 years ago

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.