The length of a football field is x. the width of the field is 70 yards less than the length. write an expression that represents the perimeter of the field without parentheses.

the expression representing the perimeter of the field is 4x + 280

Step-by-step explanation:

The perimeter of a figure is the distance around it.

The formula for determining the perimeter of a rectangle is expressed as

Perimeter = 2(length + width)

The length of a football field is x. The width of the field is 70 yards less than the length. This means that the width of the football field is x - 70 yards.

an expression that represents the perimeter of the field without parentheses would be

Perimeter = 2(x + x- 70) = 2(2x + 70)

= 4x + 280

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places