MATHEMATICS HIGH SCHOOL

What is the opposite and reciprocal of –1.8?Ο -1.8, 9/5

Ο 1.8, -5/9

Ο 1.8, 8.1

Ο 1.8, 5/9

Answers

Answer 1
Answer: Given a number "x" its opposite is "-x"
Given a number "x" its reciprocal is "-1/x"

-1.8
opposite=-(-1.8)=1.8
reciprocal=1/(-1.8)=-1/1.8=-0.5555....=-5/9

Answer: 1.8 , -5/9
Answer 2
Answer: The opposite number would be the same distance from zero on the number line in the opposite direction... -1.8 is 1.8 units from zero in the negative direction, so the opposite would be...

1.8 (in the positive direction)

The reciprocal refers to a fraction with the numerator and denominator flipped into the opposite position, so we need to convert to a fraction and then flip it.

-1.8 = -1 8/10 = -18/10 = -9/5 ... now flip it for the reciprocal

-9/5 turns into -5/9

So your answer is  1.8, -5/9

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Answers

Ok, the formula to find the area of a regular polygon is...

A = 1/2 nsr

In this equation...

n = number of sides
s= side length
r = apothem (radius of the inscribed circle)

To find the area, we must first find the apothem. The apothem is the radius of the inscribed circle (draw a line from the center of the figure to the center of one of the sides). If you draw the apothem in to the figure, it creates a right triangle with a hypotenuse of 13.07 in and one side length of 5 in (1/2 of the figure's side length). Now we can find the apothem with the formula

a^2 + b^2 = c^2
a^2 = c^2 - b^2
a^2 = 13.07^2 - 5^2
a^2 = 170.8249 - 25
a^2 = 145.8249
a = 12.076

Now we have the value for the apothem and we can plug it into the area formula...

A = 1/2 nsr
(recall that n = number of sides; s= side length; r= apothem)

A = 1/2(8×10×12.076)
A = 40×12.076
A= 483.04 in^2

Rounded to the nearest tenth would be...

483.0 in^2

Solve the equation 19 − x = 27
x = 8
x = 18
x = 46
x = -8

Answers

x = -8.
subtract 19.
-X = 8
divide by -1.
X = -8

Which of the following formulas would find the lateral area of a right conewhere r is the radius and s is the slant height?

Answers

Step-by-step explanation:

option A

lateral surface area = π r s

where s = slant height , r = radius

.

hope this will be helpful to you

please mark my answer as brainlist if you find it useful.

Answer:

A. LA=Pi rs

Step-by-step explanation:

If a bicycle cost $70.50 but it's on sale for 47% off how much is the discount what is the sale price

Answers


first multiply the two terms together to find out how much money is being discounted

$70.50 x .47 = 33.135

now subtract that number from $70.50

$70.50 - 33.135 = $37.37

ANSWER: the discount is $33.14 & the sale price is $37.37

Graph with a line going through points zero comma two point five and four comma two point five.Select the equation of the line that passes through the point (3, −1) and is perpendicular to the line on the graph.

y = −1
y = 3
x = −1
x = 3
please help :(

Answers


-- The points (0, 2.5) and (4, 2.5) are both 2.5 above the x-axis.

-- The line through them is a horizontal line.   Its equation is  y = 2.5 .

-- Any line perpendicular to it is a vertical line.

-- The vertical line through the point (3, -1) is the line    x = 3 .

Answer:

The answer is D. x = 3

Good luck on your schoolwork!

This problem is kinda hard can you help me

Answers

Answer:

B - 5

Step-by-step explanation:

K: 60

M: 60 x 25%; 60 x .25 = 75

K: 1500/60 = 25

M: 1500/75 = 20

25-20=5

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