At Olivia's Burger House, each burger costs the same price. John buys 5
burgers for $7.50.
What is the cost of one burger?

$1.50 each

Step-by-step explanation:

7.50/5=1.50 each burger is $1.50

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the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950