book Maths Puzzle Numerical Ability

what is the answer for: d=10+5t-1/2(10)t(squared) t=(2,6)
you have to make a t-chart to solve.
thank you

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book Other Question

2 Questions: 1,638 and 12,680 is divisible by what

Is this correct: 1,638= 2, 9
12,680=2
A wire of length 17cm is bent to make an isoceles triangle with base length of 6cm. What is the area of this triangle? Please help me with the steps and the formula.
Thank you!