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3 years ago

Which two events are complements?

Mathematics

1 answer:

VARVARA [1.3K]3 years ago

7 0

Well, Complementary events are two outcomes of an event that are the only two possible outcomes.
So, getting a head or a tail when tossing a coin is one of them because there are only 2 possible outcomes. Heads or tails.

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Evaluate 4(2a – b) when a = –1 and b = 5.

grin007 [14]

Hey There!

<h2>Question:-</h2>

$\sf \longmapsto \: 4(2a - b)$

This is a algebraic expression. The values of a and b are given. The values are as follows :-

a = -1

And,

b = +5 .

<h2>Solution:-</h2>

$\sf \longmapsto4(2a - b)$

Note that a is multiplied with 2 that is :-

$\sf \longmapsto4(2 \times a \: - b)$

Now, Insert the values that is a = -1 and b = 5 :-

$\sf \longmapsto4(2 \times - 1 - 5)$

Here,we need to follow BODMAS Rule.

B = Brackets

O = Orders

D = Division

M = Multiplication

A = Addition

S = Subtraction

We need to solve the bracket's calculations first as it is the rule.

So, Firstly Multiply (2 × -1) :-

$\sf \longmapsto4( - 2 - 5)$

Note that, (-) × (-) equals to (+).

So, it will be 5+2,But as 5 is bigger number than 2, 5 contains a minus sign.So the result will be -7.

$\sf \longmapsto4( 5+ 2)$

On Simplification:-

$\sf \longmapsto4( - 7)$

$\sf \longmapsto4 \times (- 7)$

$\sf \longmapsto \: - 28$

______________________________________

Henceforth the solution of the algebraic expression is :-

$\bf \:- 28$

Option B is correct!

______________________________________

I hope this helps!

Please let me know if you have any questions.

~MisterBrian

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2 years ago

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Read the problem.

Brut [27]

Answer:

I think that Sarah sent 70 percent of the text messages , so you have to shade 70 of them .

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3 years ago

Steps for showing percent of 2028÷30%

4vir4ik [10]

2028/x=100/30
(2028/x)*x=(100/30)*x we multiply both sides of the equation by x
2028=3.3333333333333*x we divide both sides of the equation by (3.3333333333333) to get x
2028/3.3333333333333=x 
608.4=x 
x=608.4
so there for its 608.4 hope this helps.

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4 years ago

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Solve the following equation algebraically X^2=36

lara [203]

Answer:

I think the answer is C.

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Order these rational numbers in order from least to greatest 1/5 and -0.4 and -1/4 and 0.5

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