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3 years ago

What is 3 3/9 as a decimal

Mathematics

2 answers:

Sophie [7]3 years ago

8 0

Answer:

3.3333333333

Step-by-step explanation:

3 3/9 --> 10/3

10 (dived by) 3=3.3333333333

ss7ja [257]3 years ago

3 0

3.9 that’s would be my answer

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zubka84 [21]

Answer:

See Explanation Below

Step-by-step explanation:

Given

$(sin x - cos x)^2 = sec^2x - tan^2x - 2sinx.cos x.$

Required

Prove

To start with; we open the bracket on the left hand side

$(sin x - cos x)^2 = (sin x - cos x)(sin x - cos x)$

$(sin x - cos x)^2 = (sin x )(sin x - cos x)- (cos x)(sin x - cos x)$

$(sin x - cos x)^2 = sin^2 x -sinx cos x - sin xcos x + cos^2 x$

$(sin x - cos x)^2 = sin^2 x -2sinx cos x + cos^2 x$

Reorder

$(sin x - cos x)^2 = sin^2 x + cos^2 x - 2sinx cos x$

From trigonometry;

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

So;

$(sin x - cos x)^2 = sin^2 x + cos^2 x - 2sinx cos x$

becomes

$(sin x - cos x)^2 = 1 - 2sinx cos x$

Also from trigonometry;

$sec^2x - tan^2x = 1$

So,

$(sin x - cos x)^2 = 1 - 2sinx cos x$

becomes

$(sin x - cos x)^2 = sec^2x - tan^2x - 2sinx cos x$

Proved

3 0

3 years ago

A number line is shown. Which expression represents the distance between two points, X and Y, on the number line?

IrinaK [193]

Answer: C. |-4 - 3|

<u>Step-by-step explanation:</u>

x = -4

y = 3

The distance between them is the difference. The mathematical operation for difference is subtraction.

Distance is a unit of measurement. Measurements cannot be negative so the absolute value sign is used to ensure the difference is positive.

4 0

3 years ago

The diagram shows a right-angled triangle.

Karo-lina-s [1.5K]

Answer:

sorry j don't have my calculator but

sine of angle x°=opposite 6cm/9cm

byee

8 0

2 years ago

Read 2 more answers

Help please. I need help with the last one

snow_lady [41]

(-1,4), (1,1), (3,-2)

6 0

4 years ago

Solve the compound inequality 6b < 42 or 4b + 12 > 8

swat32

Answer:

b<7

Step-by-step explanation:

6b<42

42/6 = 7

b<7

3 0

3 years ago