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3 years ago

6

When you are using a bar model to solve the problem which bar should you draw first

1 answer:

kotykmax [81]3 years ago

5 0

Answer:The bar model is a pictorial representation of a problem. In a word problem the bar model helps students to visualize the relationship between the numbers given and what are they looking for. For subtraction ( and addition ) you can use Part - Whole bar model. Whole - Part 1 = Part 2.

Step-by-step explanation:

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Find the exact value of tan(x-y) if sin x=8/17 cosy = 3/5

jolli1 [7]

To solve the the question we proceed as follows:

From trigonometric laws

$(cos x)^2+(sin x)^2=1$

$(cos x)^2+(sin x)^2=1$

$sin (x-y)=sin$ $x$ $sin$ $y-sin$ $y$ $cos$ $x$

$cos (x-y)=cos$ $x$ $cos$ $y+sin$ $x$ $xin$ $y$

si $x=\frac{8}{17}$

$cos$ $x=sqrt(1-(sin x)^2)=sqrt(1-64/289)=sqrt(\frac{225}{289} )=\frac{15}{17}$

$cos$ $y=\frac{3}{5}$

$sin$ $x= sqrt(1- (cos x)^2)= sqrt(1-\frac{9}{25} )=sqrt(\frac{16}{25} )=\frac{4}{5}$

thus

$tan (x-y)=[sin (x-y)]/[cos (x-y)]$

=[sin x cos y-sin y cos x]/[cos x cos y+sin x sin y]

plugging in the values we obtain:

$[8/17 *3/5-4/5*15/7]/[15/17*3/5+8/17*4/5]$

simplifying

$[24/85-60/85]/[45/85+32/85]$

$=-\frac{36}{77}$

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2 years ago

What is the volume of the cube shown?<br> 1/4 cm

murzikaleks [220]

(1/64)cm^3

Step-by-step explanation:

edge(a)= 1/4cm

volume of cube

=a^3

=(1/4)^3

=(1/64)cm^3

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2 years ago

Why do we need to solve the volume of a figure? When do we need it in real life? Give a situation.

Ksivusya [100]

Answer:

we need to solve the volume of a figure in order to know the amount of substance in an object

we need volume in many area such as labs when mixing chemicals or vaccines

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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