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jarptica [38.1K]
3 years ago
5

Hey guys, I need your help again!! This is confusing me.

Mathematics
2 answers:
victus00 [196]3 years ago
3 0
x^2-18x+81=(x-9)^2=(x-9)(x-9)

So it's A.

belka [17]3 years ago
3 0
(x - 9)(x + 9) is incorrect answer

Correct:
x^2 - 18x + 81
= (x - 9)^2
= (x - 9)(x - 9)

Answer
A. The answer is incorrect; the plus sign should be a minus sign.
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A covered water tank is in the shape of a cylinder. The tank has a 28-inch diameter and a height of 66 inches. To the nearest sq
ad-work [718]
A = 2 \pi rh + 2 \pi r ^{2}
r =  \frac{1}{2} (28) = 14
A = 7037.17
7 0
3 years ago
Read 2 more answers
Find the area of the triangle below.<br>Be sure to include the correct unit in your answer.<br><br>​
OleMash [197]

Answer:

area of triangle= 1/2*h*b

= 1/2*6*16

=3*16

= 48 yd²

This is your answer. If I'm right so,

Please mark me as brainliest. thanks!!!

5 0
3 years ago
100 points , please help. I am not sure if I did this correct if anyone can double-check me thanks!
Nookie1986 [14]

Step-by-step explanation:

\lim_{n \to \infty} \sum\limits_{k=1}^{n}f(x_{k}) \Delta x = \int\limits^a_b {f(x)} \, dx \\where\ \Delta x = \frac{b-a}{n} \ and\ x_{k}=a+\Delta x \times k

In this case we have:

Δx = 3/n

b − a = 3

a = 1

b = 4

So the integral is:

∫₁⁴ √x dx

To evaluate the integral, we write the radical as an exponent.

∫₁⁴ x^½ dx

= ⅔ x^³/₂ + C |₁⁴

= (⅔ 4^³/₂ + C) − (⅔ 1^³/₂ + C)

= ⅔ (8) + C − ⅔ − C

= 14/3

If ∫₁⁴ f(x) dx = e⁴ − e, then:

∫₁⁴ (2f(x) − 1) dx

= 2 ∫₁⁴ f(x) dx − ∫₁⁴ dx

= 2 (e⁴ − e) − (x + C) |₁⁴

= 2e⁴ − 2e − 3

∫ sec²(x/k) dx

k ∫ 1/k sec²(x/k) dx

k tan(x/k) + C

Evaluating between x=0 and x=π/2:

k tan(π/(2k)) + C − (k tan(0) + C)

k tan(π/(2k))

Setting this equal to k:

k tan(π/(2k)) = k

tan(π/(2k)) = 1

π/(2k) = π/4

1/(2k) = 1/4

2k = 4

k = 2

8 0
3 years ago
I have a shape. one side is 13cm, the opposite side is 9cm, the top is 11cm, and the bottom is 10 cm. is it a parallelogram or a
Shtirlitz [24]
It would be a trapezoid because parallelograms have the top and bottom usually the same number.
3 0
3 years ago
Can someone help me plz
andrey2020 [161]
A- (6,-3) B- (9,-3) C- (9,-7)
3 0
3 years ago
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