Write the quadratic function in vertex form.

y = x2 - 14x + 53

a. y = (x - 7)2 - 4

b. y = (x + 7)2 - 4

c. y = (x - 7)2 + 4

d. y = (x + 7)2 + 4

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step-by-step explanation:

1+2+3+4+5+6+7+8+9+10 = 55

2*10 = 20

55-20 = 35

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.