If for all values of x, what is the value of

Chemistry balance then what type of reaction are they i don't know why it keeps saying math when i put chem

Abarbecue sold 26 hamburgers and hot dogs. hamburgers sell for $3.50 each and hot dogs sell for $2.00 each. if the barbecue made $70 in sales, determine and state the number of hot dogs sold.

How can you construct perpendicular lines and prove theorems about perpendicular lines