Chapter 4: Problem 7
If \(3 a+2 b=24\) and \(4 a+5 b=53\), what is the value of \(a+b\) ? A) 2 B) 7 C) 9 D) 11
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A submarine currently operating at 100 feet below the surface of the ocean begins to dive to increased depths at a rate of 30 feet per minute. Which of the following equations represents the submarine's depth below the surface, \(d\), in feet, \(m\) minutes after beginning to dive? A) \(d=100+30 \mathrm{~m}\) B) \(d=100-30 \mathrm{~m}\) C) \(d=100-30\) D) \(d=100 m-30\)
A craft store sells specialty beads for $$\$ 1.00$$ for a single bead but will give a discount if a customer buys more than one bead. For each bead after the first, the price per bead goes down until it reaches 75 cents per bead, the lowest possible price, once 5 or more beads are purchased. Which of the following graphs represents the cost per bead in cents, \(y\), of buying \(x\) beads in a single visit?
A) NO CHANGE B) the war saw Harpers Ferry change hands eight times, C) Harpers Ferry changed hands eight times during the war, D) eight was the number of times Harpers Ferry changed hands,
A customer bought a clock for $$\$ 27.50$$, which included a \(10 \%\) sales tax. What was the price of the clock before tax? A) $$\$ 2.75$$ B) $$\$ 25.00$$ C) $$\$ 30.25$$ D) $$\$ 30.56$$ $$ \begin{array}{|c|c|} \hline \text { List } \mathrm{X} & \text { List } \mathrm{Y} \\ \hline 5 & 9 \\ \hline 8 & 10 \\ \hline 13 & 11 \\ \hline 13 & 15 \\ \hline 15 & 19 \\ \hline 18 & 20 \\ \hline \end{array} $$
The author indicates that prior to the Stanford University study the scientists generally believed that antibiotic-resistant strains of tuberculosis A) had a better chance of survival than their antibiotic-susceptible ancestors. B) would once again become the most deadly of diseases. C) resulted in lowered amounts of sputum in those they infect. D) did not have a survival rate equal to that of non-resistant strains.
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