9 + x 7 simplified with explanation plss :)

Prove cos(x+y)+cos(x-y)=2cosxcosy

NISA [10]

Work shown above! Hope ya understand!

6 0

3 years ago

Could someone help me on this

allochka39001 [22]

Answer:

13.) 314.2 in²

15.) 181.5 ft²

Step-by-step explanation:

The area of a circle is found using the equation:

A = πr²

In this equation, "π" represents the number pi (3.14....) and "r" represents the radius (half the diameter).

For 13.), you have been given the radius. Thus, you can substitute it into the equation and solve for "A".

A = πr²

A = π(10)²

A = π x (100)

A = 314.2 in²

For 15.), you have been given the diameter. To find the radius, you need to divide this value by 2. Once you find the radius, you can plug it into the equation and simplify like above.

diameter = 15.2 ft
radius = 7.6 ft

A = πr²

A = π(7.6)²

A = π x (57.76)

A = 181.5 ft²

8 0

2 years ago

You cut a sheet of paper along its diagonal, as shown. What is the length of the diagonal? Round your answer to the nearest tent

AVprozaik [17]

 FIRST OF ALL THERE IS NO FIGURE.

ELSE I AM GIVING YOU CLUE. 

LET SHEET IS RECTANGLE IN SHAPE. SO , WE ASSUME IT'S LENGTH AND BREADTH BE 'L' & 'B'.

NOW WE CAN FIND DIAGONAL BY USING PYTHAGORAS THEOREM. 

 $diagonal = \sqrt{ {l}^{2} + {b}^{2} } \: units$ 

8 0

3 years ago

Read 2 more answers

How do I show my work 826÷2

eduard

Hope this helps!! Good luck

8 0

3 years ago

Find the surface area of the prism? HELP I need the steps if possible

Helga [31]

To find the surface area of a figure, find the area of all the shapes that make up the figure to get the area multiply Base by the height. First let's find the area of the rectangle and the front that makes the ramp. To do this multiply 20 by 17 to get 340. Then let's get the area of the rectangle on the bottom by multiplying 15 by 20 to get 300. Now lets find the area of the rectangle in the back we will do this by multiplying 8 by 20 get 160. To get the area of a triangle multiply the base by the height and then divided by 2. so for one of the triangles let's multiply A perfect in which gives us 120 and divide that by 2 to get 60. because the other triangle has the same dimensions, the area of the other triangle will also be 60. now let's out of all the areas that we have from the shapes which will be 340 + 300 + 160 + 60 + 60 which will give us 920 so the area of the figure is 920ft^2

(can i get brainelist pls)

5 0

3 years ago