Solve the problem.A force of 144 lb acts in the direction N 45° E. Find its east and north components.
A. 72
east; 72 north
B. 72 east; 72
north
C. 72 east; 72 north
D. 72
east; 72
north
Answer: D
Mathematics
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Solve the problem.In an arithmetic sequence with first term P0 and common difference d, the value of PN is given by
A. P0 + Nd. B. P0 + (N - 1)d. C. d + NP0. D. d + (N - 1)P0. E. none of these
Mathematics
Convert to a mixed numeral.
A. 21
B. 2
C. 3
D. 1
Mathematics
Solve.In chemistry, the pH of a substance is defined by 
where 
is the hydrogen ion concentration in moles per liter. Find the 
of a sample of lake water whose hydrogen ion concentration, 
, is 
moles per liter. (Round to the
nearest tenth.) A. 6.4 B. 7.3 C. 10.1 D. 8.5
Mathematics
Compute the dot product u ? v.u = 
, v = 
A. 25 B. 18 C. 15 D. 0
Mathematics