29. Which statement is NOT always true? 1) The product of two irrational numbers is irrational.
2) The product of two rational numbers is rational.
3) The sum of two rational numbers is rational.
4) The sum of a rational number and an irrational number is irrational.

The answer is 4

The sum of a rational number and irrational number is irrational, because sometimes the sum rational number and irrational number is rational

answer:

length=40 feet , width =40 feet

step-by-step explanation:

given : tina wants to create a rectangular area of 1,600 square feet for her pet and can afford to purchase 160 feet of fence.

to find : the dimensions of the rectangle

solution :

let x be the length and y be the width of the rectangle.

by given situations,

1) area is 1600 square feet

i.e,

2) perimeter is 160 feet

i.e,

now, we solve the equation [1] and [2] to get the value of x and y

so,   from equation [2],

substitute in [1]

either y=40 or y=-40

we neglect y=-40, so y=40

substitute in value of x,

therefore, the length is 40 feet and width is 40 feet.