At noon, the atmospheric pressure at a weather station was 763 mmHg. At 4 p.m., the atmospheric pressure had changed by 29 mmHg.

Which expressions could represent the atmospheric pressure at the weather station at 4 p.m.?

Choose two answers that are correct.

A.
(29 – 763) mmHg

B.
–(763 + 29) mmHg

C.
(763 – 29) mmHg

D.
(763 + 29) mmHg

Question

At noon, the atmospheric pressure at a weather station was 763 mmHg. At 4 p.m., the atmospheric pressure had changed by 29 mmHg. 
 
Which expressions could represent the atmospheric pressure at the weather station at 4 p.m.?
 
Choose two answers that are correct.
 
 A.
(29 – 763) mmHg
 
 B.
–(763 + 29) mmHg
 
 C.
(763 – 29) mmHg
 
 
 D.
(763 + 29) mmHg

isaiah.feynman · Answer

Let the pressure at 4 be x. It follows that |dw:1415305635627:dw|