Find the surface area of a cone with radius 5 ft and height 21 ft substitute pi for 3.14​

417.4ft^2

Step-by-step explanation:

Surface area of a cone = πr(r+√r²+h²)

r is the radius

h is the height

Substitute

Surface area of a cone = π(5)(5+√5²+21²)

Surface area of a cone = πr(5+√25+441)

Surface area of a cone = π(5)(5+21.59)

Surface area of a cone = 3.14*5*26.59

Surface area of a cone = 417.4ft^2

Hence the surface area of the cone is 417.4ft^2

your answer is 23/2 - 13.5

step-by-step explanation:

7/2 evaluates to

multiply x and 4.5

multiply x and 1

the x just gets copied along.

the answer is x

x

4.5*x evaluates to 4.5x

multiply 3 and 4.5x

multiply 1 and x

the x just gets copied along.

x

4.5*x*3 evaluates to 13.5x

7/2-4.5*x*3 evaluates to

  + 8 =

the answer is

7/2-4.5*x*3+8 evaluates to

the sum of the lengths of any two sides of a triangle is greater than the length of the third side. if you take the three sides of a triangle and add them in pairs, the sum is greater than (not equal to) the third side. if that is not true, then it is not possible to construct a triangle with the given side lengths.

step-by-step explanation: