16. 5 2
х у
a. yes; 5x – 2y = 70; x: 14; y:-35
b. yes; 2x - 5y = 70; x:-35; y: 14
c. yes; 2x - 5y = 70xy; x: 14; y:-35
21.
d. no
Find the next three terms of each
arithmetic sequence.
17.49,-35, -21, -7,...

1.   an exact solution requires a radical solution - no decimal approximation.2. (a)4x^3 = 756x^3 = 756/4 = 189x =   cube root of 189 =   5.74   to nearest hundredth answer(b)   189 = 3*3*3*7   so we can write the cube root of 189 as 3∛7 answerchecking (a) 4*(5.74^3 =   756.48   which is very close(b)   4* ((3∛3)^3   = 4*189   = 756   - spot on! 3. i would use solution b because the original question asked for an exact solution.