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2 years ago

Evaluate -4a + 10 when a = -2

Mathematics

1 answer:

stiks02 [169]2 years ago

4 0

Answer:

18

Step-by-step explanation:

replace a with -2

-4(-2) + 10

multiply the -4 and the -2, the negatives cancel out and leave you with 8

8 +10

just add

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Find the following trigonometric values,rounded to 4 decimal places: 1) tan45. 2)sin70. 3) cos30. 4) cos20

harina [27]

1) Tan45 = 1
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3) Cos30 = 0.8660
4) Cos20 = 0.9397

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2 years ago

Find the derivative of x^2+6x+9 at the point (2,6).

Pachacha [2.7K]

The derivative of the function is 2x+6.
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Hope this helps :)

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3 years ago

Suppose an isosceles triangle abc has a=pi/4 and b=c=4. What is the length of a^2?

Zanzabum

The law of cosines states that, if $\alpha$ is the angle between sides b and c,

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So, plugging our values, we have

$a^2 = 16+16-2\cdot 4\cdot 4\cdot\cos\left(\dfrac{\pi}{4}\right)$

This is equal to

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3 0

2 years ago

Look at the image for the problem :)

8_murik_8 [283]

Answer:

$\displaystyle V = 28 \pi \ ft^3$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Geometry

Volume of a Cylinder Formula: $\displaystyle V = \pi r^2h$

V is volume
r is radius
h is height

Step-by-step explanation:

Step 1: Define

Radius r = 2 ft

Height h = 7 ft

Step 2: Solve for V

Substitute in variables [Volume of a Cylinder Formula]: $\displaystyle V = \pi (2 \ ft)^2(7 \ ft)$
[Volume] Evaluate exponents: $\displaystyle V = \pi (4 \ ft^2)(7 \ ft)$
[Volume] Multiply: $\displaystyle V = 28 \pi \ ft^3$

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2 years ago

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kupik [55]

$20 per hour

8 hrs a day

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2 years ago