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which quadrilaterals have two pairs of parallel sides?
rhombus
trapezoid
rectangle
isosceles trapezoid

rhombus, rectangle

Step-by-step explanation:

All parallelograms have two pairs of parallel sides.

A rhombus is a parallelogram. A rectangle is a parallelogram.

A trapezoid is not a parallelogram.

rhombus, rectangle

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

the answer is b.

step-by-step explanation:

by the trigonometric ratio tangent, tangent equals opposite divided by adjacent.

therefore, tan(50) equals ac/3

multiply each side by 3 to get: ac=3tan(50)

the answer is b.