Make "t" the subject of the formula s=2t+5.

t =

Step-by-step explanation:

Given

s = 2t + 5 ( subtract 5 from both sides )

s - 5 = 2t ( divide both sides by 2 )

= t

  5.  A) two solutions

  6.   one solution

Step-by-step explanation:

5. A graph shows the curve has two x-intercepts, so two solutions. You can also figure this by looking at the discriminant:

  b^2 -4ac = (7)^2 -4(-4)(8) . . . . a positive number

When the discriminant is positive, there are two real solutions.

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6. The equation factors as ...

  0 = 3(x +3)^2

This will have one real solution at x=-3.