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3 years ago

HELP PLEASE!! Determine the value of “?” 8x-40=? (X-5)

Mathematics

2 answers:

sergij07 [2.7K]3 years ago

8 0

The answer is five because if you multiply it times five it will give you 40 OK

drek231 [11]3 years ago

3 0

Answer:

Step-by-step explanation:

8(5)-40=0

40-40=0

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Explain the difference between solving an and inequality and an or inequality.

adell [148]

Answer:

An and inequality contains compound restrictions, i.e., x must be less that 4 and greater than 1, while an or inequality contains multiple sets of separate restrictions, in which, only one must be fulfilled, i.e., x is greater than 5 or less than -3.

Hope it helps :)

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2 years ago

Find the equation of the straight line which passes through the point (2,3) and is

Elena L [17]

Answer: y = 1.73*x - 0.46

Step-by-step explanation:

For a linear equation of the form:

y = a*x + b

Where a is the slope and b is the y-intercept.

If we have an angle of A degrees with respect to the x-axis, the slope of the function can be calculated as:

Tan(A) = a.

in this case, we have we have an inclination of 30° to the positive x-axis (measured from the positive y-axis) and we know that the angle between the positive x-axis and the positive y-axis is 90°, then the angle measured from the positive axis will be such that:

A + 30° = 90

A = 90° - 30° = 60°

Then the slope is:

a = Tan(60°) = 1.73

Then we have the equation:

y = 1.73*x + b

And we know that this line passes through the point (2, 3) then we can replace x by 2 and y by 3 in the equation, and find the value of b.

3 = 1.73*2 + b

3 - 1.73*2 = b = -0.46

Then the equation is:

y = 1.73*x - 0.46

4 0

3 years ago

Which decimal is closest in value to the fraction below? 2/7 a) 0.286 b) 0.3333 c) 0.4

Anastasy [175]

7 ) 2. 000000
------------------
0. 2857

Its a

4 0

3 years ago

Read 2 more answers

Solve for b. 13/b = 8/1 A. b=1.25 B. b=1.26 C. b=16.25 D. b=1.625

Sati [7]

Answer: $b=13/8$

Cross multiply

$(13)*(1)=8*b\\13=8b$

Flip the equation

$8b=13$

Divide both sides by 8

$8b/8=13/8\\b=13/8$

6 0

3 years ago

A flagpole sits on the top of a cliff that is 25 m above sea level. If the angle of elevation from a boat on the water to the to

OLEGan [10]

Answer:

3.2 m

Step-by-step explanation:

Let x be the distance between the cliff and the boat.

Since the cliff is 25 m above sea level and the distance between the boat and the height of the cliff are perpendicular, and the line of sight of the boat to the base of a cliff is 29 , these three form a right-angled triangle with hypotenuse side as the line of sight of the elevation of the boat to the base of the cliff.

So, using trigonometric ratios, tan29° = 25/x

x = 25 m/tan29° = 25 m/0.5543 = 45.1 m

Also, the line of sight of the top of the flagpole, the cliff and the distance between the boat and the cliff form a right-angled triangle with hypotenuse side as the line of sight of the top of the flagpole,

Now, the angle of elevation of the top of the flagpole from the top of the boat is 32°, we now find the angle opposite to x, the distance from the boat to the cliff.

Since it is a right-angled triangle, thus one angle is 90° and the unknown angle is A.

So, 90° + 32° + A = 180° (sum of angles in a triangle)

122° + A = 180°

A = 180° - 122°

A = 58°

Let y be the length of the flagpole. In this same triangle, using the sine rule, with x being the side opposite A and 25 + y being the side opposite the 32° angle, where 25 + y = height of cliff + length of flagpole, then

x/sinA = (25 + y)/sin32°

25 + y = xsin32°/sinA

y = xsin32°/sinA - 25

y = 45.1sin32°/sin58° - 25

y = 45.1 × 0.5299/0.8480 - 25

y = 45.1 × 0.6249 - 25

y =28.183 - 25

y = 3.183

y ≅ 3.2 m to one decimal place

6 0

3 years ago