In 1950 the number of retirees was approximately 150 per thousand people aged 20-64. In 1990 this number rose to approximately 200, and it is projected to rise to 275 in 2020. Model N as a piecewise linear function of the time t in years since 1950, and use your model to project the number of retires per thousand people aged 20-64 in 1998. (Round you answer to the nearest integer.)
?
A. 220 people per thousand
B. 154 people per thousand
C. 198 people per thousand
D. 264 people per thousand
E. 286 people per thousand
Answer: A
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Find f so that F = ?f. If the fuction is not conservative state so.F(x, y, z) = (y - z)i + (x + 2y - z)j - (x + y)k
A. f(x, y, z) = xy + y2 - x - y + C B. f(x, y, z) = xy + y2 - xz - yz + C C. f(x, y, z) = x(y + y2) - xz - yz + C D. f(x, y, z) = x + y2 - xz - yz + C
Find the LCD for the list of fractions. Write the list as equivalent fractions with the LCD as their denominators.
, 
, 
A. 7(r + 9); 
, 
, 
B. r(r + 9)2; 
, 
, 
C. 7(r + 9)2; 
, 
, 
D. 7r(r + 9)2; 
, 
, 
Provide an appropriate response.Find integers m and n such that mn = 15 and m + n = 8.
A. 5, 8 B. -5, 3 C. 5, 3 D. -5, -3
Find the inverse matrix of A.A = 
A. 
B. 
C. 
D. 