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2 years ago

(please help me)

Mathematics

1 answer:

Eduardwww [97]2 years ago

8 0

Answer:

i have no idea

Step-by-step explanation:

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If f(x)=x^2-10, what is f(-2)

andrew-mc [135]

The answer is -6.

-2^2= 4

4-10=-6

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3 years ago

Please solve: 3.15=X-6.85

Andrew [12]

Answer:

X=10

Step-by-step explanation:

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3 years ago

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What is the volume of this cylinder

arsen [322]

Answer:

471.24 Inches

Step-by-step explanation:

V= πr²h
(diameter=10, Radius = 5)
V = (22/7 × 5 × 5) × 6
V= 550 × 6
V = 3300 ÷ 7
V = 471.2389=round off
V = 471.24 inches

6 0

3 years ago

(Step to step work) sin x(cotx + tanx)

11Alexandr11 [23.1K]

solving $sin(x)(cot(x) + tan(x))$ we get $sec(x)$

Step-by-step explanation:

We need to solve: $sin(x)(cot(x) + tan(x))$

Solving:

We know:

$cot(x)=\frac{cos(x)}{sin(x)}\\ and\,\,tan(x)=\frac{sin(x)}{cos(x)}$

Putting the values of cot(x) and tan(x):

$sin(x)(cot(x) + tan(x))\\=sin(x)(\frac{cos(x)}{sin(x)}+\frac{sin(x)}{cos(x)})$

Taking LCM:

$=sin(x)(\frac{cos(x)cos(x)+sin(x)sin(x)}{sin(x)cos(x)})\\=sin(x)(\frac{cos^2(x)+sin^2(x)}{sin(x)cos(x)})$

We know that: cos^2x+sin^2x=1

and using identity: cos(x)sin(x)=sin(2x)*1/2

$=sin(x)(\frac{1}{sin(2x)\frac{1}{2}})\\=sin(x)(\frac{2}{sin(2x)})$

Using identity: sin(2x)=2cos(x)sin(x)

$=sin(x)(\frac{2}{2sin(x)cos(x)})\\Cancelling\,\,same\,\,terms\,\,in\,\,numerator\,\,and\,\,denominator:\\=\frac{1}{cos(x)} \\=sec(x)$

So, solving $sin(x)(cot(x) + tan(x))$ we get $sec(x)$

Keywords: Trigonometry

Learn more about Trigonometry at:

#learnwithBrainly

8 0

3 years ago

Factor: (14.25r^4-24.375r^3+10.125)=0

omeli [17]

Answer:

1, 1.5

Step-by-step explanation:

Use the rational roots theorem. Factor out until you get the maximum simplification.

0.375(x−1)(2x−3)(19x2+15x+9)

However, if you wanted to solve this equation for r, you will get 1, 1.5 using the quartic formula.

6 0

2 years ago