Select all that apply.
Which of the following statements are always true of parallelograms?
It is a quadrilateral
It has right angles
Both pairs of opposite sides are parallel
The sides are all the same lengths
All four angles are congruent

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of