Can anyon help me plzz... Solve these order of operation:
A. (2.8+(-1^4)×(3.4^0-4×0.5)
B. 2.8÷(-3.1+5^2)
C. 15.3+3.1×4-8×(-0.6)​

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Solve for x where 0 equation: cot^2x+2cotx+1=0