exam Maths Puzzle Numerical Ability

Could you please assist me with this problem?

y=-5 x 3 + 4x^2+6x-7

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exam Other Question

Can you help me please****

Use the intermediate value theorem to determine whether g(x)=4x^3-3x+3 has a zero between -2 and -1
this is a problem is about a real life situation Ho can I show this an a graph?

Real life situation will be when using my checking account and balancing it out every week to see