Which of the following statements is not always true?

a.
in a rhombus, both pairs of opposite sides are parallel.
b.
in a rhombus, the diagonals bisect each other.
c.
in a rhombus, all four angles are congruent.
d.
in a rhombus, both pairs of opposite sides are congruent

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950

a is the right answer