exam Maths Puzzle Numerical Ability

write an equation for the linear function f satisfying the given conditions
1. f(3)=4 and f(0)=9
2. f(2)=7 and f(8)=1

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exam Other Question

A researcher orders a broth of 7.5% glucose for her lab. However, she needs a stronger broth, one that is 24.9% glucose. Fortunately, she has 26.9 liters of 36.1% glucose broth in the stock room. How much 24.9% glucose broth can she make? Can someone please help me with this problem?

The price of a doll increased from $600 to $800. What was the percent of the increase? Round to the nearest tenth percent.

Thanks in advance for your help!