True or false a quadrilateral is a square if and only if it is a rhombus and rectangle

True

Step-by-step explanation:

A quadrilateral is any polygon with 4 sides. It can be a square, rhombus, rectangle, parallelogram etc.

A rhombus is a parallelogram with all sides equal and the diagonals cut each other equally at right angles.

A rectangle is a parallelogram with opposite sides equal and all internal angles is at right angles. The diagonals are congruent and divided the rectangle into equal halves.

A square is a parallelogram with all sides equal and all angles equal to 90°.

Thus square fulfills the property of a rhombus and a rectangle.

Thus, if a quadrilateral which is a rhombus and a rectangle can only be a square.

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it