The first term of the arithmetic sequence is  figure 1.png)
and the common difference is (- figure 1.png)
). Which term of this sequence is  figure 2.png)
 figure 3.png)
 answer.png)
Mathematics
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Find an equation of the tangent line at the indicated point on the graph of the function.y = f(x) = 2
- x + 9, (x, y) = (4, 9)
A. y = - 
x + 11
B. y = - 
x + 9
C. y = 9
D. y = 
x - 11
Mathematics
Solve the problem.A merchant has coffee worth $40 a pound that she wishes to mix with 90 pounds of coffee worth $80 a pound to get a mixture that can be sold for $70 a pound. How many pounds of the $40 coffee should be used?
A. 30 lb B. 60 lb C. 15 lb D. 120 lb
Mathematics
Solve the given third- or fourth-order differential equation.D3y + 2 D2y - 63 Dy = 0
A. y = c1e9x + c2e-7x B. y = c1 + c2e-9x + c3e7x C. y = c1 + c2e9x + c3e-7x D. y = c1e-9x + c2e7x
Mathematics
Solve the problem.Prove that 
dt = 
dt + 
dt
What will be an ideal response?
Mathematics