exam Maths Puzzle Numerical Ability

If there are 6 * 10^9 people on the Earth and there is enough freshwater
to provide each person with 8.79 * 10^5 L, how much freshwater is on the
Earth?

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exam Other Question

Solve each of the following systems by using either addition or substitution. If a unique solution
does not exist, state whether the system is dependent or inconsistent.
10x + 2y = 7
y = -5x + 3 Hello There,

I seem to be stuck on theses problems. Any help would be greatly appreciated. Thank you. Here are the problems.

Find the domain of the following:

f(t)= 4.5