If a lead atom has an approximate mass of 3.4 x 10-25 kilograms, and a hydrogen
atom has an approximate mass of 1.7 x 10-2 kilograms, which of these statements
is true?

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

Two numbers have a sum of -19. one number is x. what expression represents the other number?

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.