NASA computer scientist Christine Darden needs to calibrate the controller for system that delivers a specific gas mixture for life support inside a space suit. The suit's main gas tank has compressed air that is 10% oxygen. And a smaller tank holds a special high-oxygen mixture that is 75% oxygen. When the helmet of suit is closed, the main tank releases 3 grams of air to mostly fill the suit. Let g be the number of grams of the high-oxygen gas that is added. What equation will help Christine find the right value for g if the final mixture should be 20% oxygen?
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1
Question 3
3.
What value for w makes the following equation true?
1 point
1
Question 4
4.
Which of the following equations are identities (which have an infinite number of solutions)?
1 point
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Question 5
5.
The local coffee shop offers a special"coffee club" deal. You pay $10 each week to get up to 5 free cups of coffee. After 5 cups, deal purchasers get a $0.30 discount on any additonal cups of coffee they buy. The normal price of a cup of coffee at the shop is $2.25. If we let c be the number of cups of coffee a person drinks in a week, which equation will help find the value for c when the cost is the same regardless of whether you buy the deal or pay the normal price?
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Question 6
6.
In the scenario above, does it ever make sense to buy the deal? If so, under what conditions is it cheaper to purchase the deal? Explain your reasoning.