exam Maths Puzzle Numerical Ability

Solve using the addition and multiplication principles.
7 + 7x < 21
Can someone help with this please I am soooo baffled.

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exam Other Question

Assume that the number of viruses present in a sample is modeled by the exponential function "f(t) 10^t," where t is the elapsed time in minutes. How would you apply logarihm to determine when the sample will grow to 5 billion viruses? An employee who produces x units per hour earns an hourly wage of y = 0.55x + 8 (in dollars). Find the hourly wage for an employee who produces 9 units per hour.

Thank you very