Ineed someone to check my answer. so this problem: -mn is rewrote as -1 . m . n correct? (the dots are in place of multiplication signs.)

50 points! antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin

Combine like terms to make a simpler expression 3z+z