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GuDViN [60]
3 years ago
6

Simplify 11 - [ 4 + 2 • 3 ]

Mathematics
1 answer:
erica [24]3 years ago
5 0

Answer:

Step-by-step explanation:

remember  PEMDAS

11-(4+6)=11-10=1

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Help I will be marking brainliest!!!
Keith_Richards [23]
<h3>Answer:  A.  18*sqrt(3)</h3>

=============================================

Explanation:

We'll need the tangent rule

tan(angle) = opposite/adjacent

tan(R) = TH/HR

tan(30) = TH/54

sqrt(3)/3 = TH/54 ... use the unit circle

54*sqrt(3)/3 = TH .... multiply both sides by 54

(54/3)*sqrt(3) = TH

18*sqrt(3) = TH

TH = 18*sqrt(3) which points to <u>choice A</u> as the final answer

----------------------

An alternative method:

Triangle THR is a 30-60-90 triangle.

Let x be the measure of side TH. This side is opposite the smallest angle R = 30, so we consider this the short leg.

The hypotenuse is twice as long as x, so TR = 2x. This only applies to 30-60-90 triangles.

Now use the pythagorean theorem

a^2 + b^2 = c^2

(TH)^2 + (HR)^2 = (TR)^2

(x)^2 + (54)^2 = (2x)^2

x^2 + 2916 = 4x^2

2916 = 4x^2 - x^2

3x^2 = 2916

x^2 = 2916/3

x^2 = 972

x = sqrt(972)

x = sqrt(324*3)

x = sqrt(324)*sqrt(3)

x = 18*sqrt(3) which is the length of TH.

A slightly similar idea is to use the fact that if y is the long leg and x is the short leg, then y = x*sqrt(3). Plug in y = 54 and isolate x and you should get x = 18*sqrt(3). Again, this trick only works for 30-60-90 triangles.

4 0
3 years ago
A shopper buys a 100 dollar coat on sale for 20% off. An additional 5 dollars are taken off the sales price by using a discount
koban [17]

Answer:

<u>12.2</u>

Step-by-step explanation:

100 - 20% = 80%, 80% - 5 =  -42, -42 - 8 = <u>-12.2</u>

6 0
3 years ago
Read 2 more answers
I am so confused i need help
Delicious77 [7]
I believe The answer is B 40
3 0
3 years ago
Read 2 more answers
Suppose your current electricity meter reading is 25,789 kWh, and the reading on your last bill was 25,350 kWh. If you are charg
Brrunno [24]

The amount of bill is $43.15

Step-by-step explanation:

Given,

Current meter reading = 25,789 kWh

Reading on last bill = 25,350 kWh

Reading for the month = Current meter reading - Last month bill reading

Reading for the month = 25789 - 25350 = 439kWh

Cost per kWh = $0.0983

Cost of 439 kWh = 0.0983*439 = $43.1537

Rounding off to nearest hundredth

Cost of 439 kWh = $43.15

The amount of bill is $43.15

Keywords: subtraction, multiplication

Learn more about subtraction at:

  • brainly.com/question/11175936
  • brainly.com/question/11203617

#LearnwithBrainly

8 0
3 years ago
Help me answer pls thanks.Dont answer if ur just put nothing or you dont know. ​
raketka [301]
Hi I want the points thanks
8 0
3 years ago
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