All categories

2 years ago

Evaluate cos 300' without using a calculator, 2 O A. 1 / O B. 1 о c va

Mathematics

1 answer:

storchak [24]2 years ago

7 0

Answer:

$Cos \ 300 = \dfrac{1}{2}$

Step-by-step explanation:

$\sf \boxed{Cos \ (2\pi - \theta) = Cos \ \theta}$

Cos 300 = Cos ( 360 - 60)

= Cos 60

$\sf = \dfrac{1}{2}$

You might be interested in

PLEASE HELP ILL GIVE BRAINLIST

sdas [7]

Answer:

Its hard to explain but essentially the zero in the 10 and 100 place cancels out the decimal essentially

8 0

3 years ago

Forty-five percent of what number is 22.5? A. 10.125 B. 100 C. 50 D. 30

Mnenie [13.5K]

Look at the answers and be logical, try rounding up so instead of 45% try 50% now 22.5 would be half the number, have a look at the answers and see what is closest to double 22.5. C looks reasonable. Hope I helped, have a nice day :)

5 0

2 years ago

Read 2 more answers

20 - 4 TIMES 4 DIVIDE 2 + 3

Tanya [424]

$20 - 4 \times 4 \div 2 + 3$

Using BODMAS formula, we see that we have first divide, then multiply, then add and finally subtract
So
$20 - 4 \times 4 \div 2 + 3 \\ = 20 - 4 \times 2 + 3 \\ = 20 - 8 + 3 \\ = 23 - 8 \\ = 15$

<h3>Answer:</h3>

<h3>Hope it helps..</h3>

ray4918 here to help

8 0

2 years ago

Read 2 more answers

What is the inverse of f(x)=3x+6 ?

scZoUnD [109]

Answer:

$\boxed{\sf \ \ f^{-1}(x)=\dfrac{x-6}{3} \ \ }$

Step-by-step explanation:

hello,

we can write

$fof^{-1}(x)=x \ and \ fof^{-1}(x)=f(f^{-1}(x))=3f^{-1}(x)+6 \ so\\3f^{-1}(x)+6=x \ \ subtract \ 6\\3f^{-1}(x)=x-6 \ \ divide \ \ by \ \ 3\\ f^{-1}(x)=\dfrac{x-6}{3}$

hope this helps

3 0

3 years ago

Find the coordinates of the circumcenter for triangle DEF with coordinates D(1,3) E(8,3) and F(1,-5) show your work

nikklg [1K]

One leg is horizontal, on the line y=3. Another leg is vertical, on the line x=1. The point where these intersect, D(1, 3) is the vertex of a right angle. Any right triangle inscribed in a circle has its hypotenuse as the diameter of the circle.

Since the triangle is a right triangle, the circumcenter is the midpoint of the hypotenuse: ((8, 3) + (1, -5))/2 = (4.5, -1).

6 0

3 years ago