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2 years ago

What are the values of A and B?

Mathematics

1 answer:

Darina [25.2K]2 years ago

6 0

I think that either A or B have to be the number of days

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If you know 72=9×8,then _is_times as many as_

Leokris [45]

Answer:

10 is 10 times as many as 10

Step-by-step explanation:

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2 years ago

The length of a rectangle is 18 cm and its breadth is 11 cm. Find area of the rectangle.

zepelin [54]

Step-by-step explanation:

Area = length×breath

=18×11

=198cm²

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2 years ago

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Select all of the number that round to 4.3 when rounded to the nearest tenth

faltersainse [42]

Answer:

4.29-4.28-4.27-4.26-4.25

Step-by-step explanation:

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2 years ago

4(2x - y) - 3x + 2y

Vladimir [108]

Answer:

5x - 2y

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Distributive Property

Algebra I

Terms/Coefficients

Step-by-step explanation:

Step 1: Define

4(2x - y) - 3x + 2y

Step 2: Simplify

Distribute 4: 8x - 4y - 3x + 2y
Combine like terms (x): 5x - 4y + 2y
Combine like terms (y): 5x - 2y

8 0

2 years ago

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Which of the following is not equal to sin⁡(-230°)?

xenn [34]

From trigonometry we know that:

if $sin(\theta)=sin(\alpha)$

then, $\theta=n\pi+(-1)^n\alpha$ (where $n$ is an integer)

This can be rewritten in degrees as:

$\theta=n(180^{\circ})+(-1)^n\alpha$ .............(Equation 1)

Now, in our case, $\alpha=-230^{\circ}$

Therefore, (Equation 1) can be written as:

$\theta=n(180^{\circ})+(-1)^n(-230^{\circ})$ ..........(Equation 2)

Now, to find the correct options all that we have to do is replace n by relevant integers and find the values of $\theta$ that match.

For n=2, (Equation 2) gives us: $\theta=2\times 180^{\circ}+(-1)^2(-230^{\circ})=360^{\circ}-230^{\circ}=130^{\circ}$ .

Thus, $sin(230^{\circ})=sin(130^{\circ})$

Now, we know that: $-sin(-50^{\circ})=sin(50^{\circ})$

Let n=-1, then:

$\theta=(-1)\times 180^{\circ}+(-1)^{-1}(-230^{\circ})=-180^{\circ}+230^{\circ}=50^{\circ}$

Thus, $sin(-230^{\circ})=-sin(-50^{\circ})$

Likewise, $sin(-230^{\circ})=sin(50^{\circ})$

Only the last option $sin(-50^{\circ})$ will never match $sin(-230^{\circ})$ because no integral value of $n$ will ever give $\theta=-50^{\circ}$

Thus the last option is the correct option.

3 0

2 years ago

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