Please solve.
-7 = z over 2 + 1

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Could someone with number 1 and 2

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)