Answer:
157.7536
Step-by-step explanation:
A = (3.14)r^2
A = 12.56^2
A = 157.7536
Answer:
Width = 3 feet
Length = 7 feet
Step-by-step explanation:
x represents the width of doghouse so,
Width = x
Length is 4 times more than its width
Length = x+4
Area of doghouse = 21 square feet
We know
Area of rectangle = Length * Width
21 = (x+4)*x
21 = x^2+4x
=> x^2+4x-21=0
Solving the above quadratic equation by factorization to find the value of x
x^2+7x-3x-21=0
x(x+7)-3(x+7)=0
(x+7)(x-3)=0
x+7 =0 and x-3=0
x= -7 and x =3
Since the width of rectangle can never be negative so, x=3
Width =x = 3 feet
Length = x+4 = 3+4 = 7 feet
Answer:
8.5
Step-by-step explanation:
2x + 3 = 20
minus 3 from both sides
2x = 20-3= 17
2x=17
divide by 2
x = 8.5
There is no restriction upon x for that function therefore the domain is all real numbers. x=(-oo, +oo)
Forty three million, eighty thousand seven hundred