Provide an appropriate response.The expression (3 + 5) ÷ 2 contains parentheses. Are they necessary? Explain.
What will be an ideal response?
Yes. Without the parentheses 5 would be divided by 2, then that answer would be added to 3. 
and 
.
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Provide an appropriate response.A chemist has two solutions that contain different concentrations of hydrochloric acid. One is a 20% concentration and the other is a 12% concentration. How many cubic centimeters of each should he mix to obtain 100 cc with a concentration of 15.2%?
What will be an ideal response?
Write the vector u as a sum of two orthogonal vectors, one of which is the vector projection of u onto v, projvu .u = 
, v = 
A. 
+ 
B. 
+ 
C. 
+ 
D. 
+ 
Write the number in decimal notation without the use of exponents.4 × 10-4
A. 4000 B. 40,000 C. 0.004 D. 0.0004
0.55 mi is 8% of what amount?
A. 6.875 miles B. 12.852 miles C. 14.545 miles D. 1.575 miles E. 10.710 miles