exam Maths Puzzle Numerical Ability

a dice is rolled. what is the probability of rolling a number less than 4 or a 7?
thanks a lot i hope you can help me solve this

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exam Other Question

need to determine if the given x-value is a zero of the function - show work
f(x)=x^3 + 5x^2 + 2x - 8
**is x = -2 a root
HLEP PLEASE

LLO A solution containing 30% insecticide is to be mixed with a solution containing 50% insecticide to make 200 L of a solutions containing 42% insecticide. How much of each solution should be used?