Solve the problem.A chemist needs 100 milliliters of a 78% solution but has only 69% and 99% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
A. 70 ml of 69%; 30 ml of 99%
B. 27 ml of 69%; 73 ml of 99%
C. 73 ml of 69%; 27 ml of 99%
D. 30 ml of 69%; 70 ml of 99%
Answer: A
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Solve the problem.Police use a formula s = S 
, where S is the test-car speed (mph) and L is the test-skid length (feet), to find the actual speed, s, in an accident which left a skid mark of length x feet. Find the actual speed (to the nearest tenth) when S = 63 mph, x = 150 ft, L = 100 ft.
A. 113.0 mph B. 51.7 mph C. 77.2 mph D. 94.5 mph
Underline the digit that occupies the given place.384?Hundreds place
A. 3
4
B. 
84
C. 38
D. None of these
Use the appropriate formula to answer the question.What Celsius temperature is equivalent to a temperature of 248° Fahrenheit?
A. 155.6°C B. 478.4°C C. 120°C D. 105.8°C
Solve the equation.-4z = - 
A. - 
B. 
C. - 
D. 