Which properties justify the steps taken to solve the system? {2+7b=0 {3a-5b=31 drag the answers into the boxes to match each step. i will mark you as brainlinest for correct !

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

What is the sum of these mixed numbers 2 1/8 + 4 3/8

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).