well, the subtotal or pre-tax bill is $23.50, now let's add the 8% tax and

so the post-tax bill is 23.50 + 1.88 = 25.38, and Jackie's tip is 20% of that

In the next 25 years, Larry will be 35 years old, while his sister will be 3 years less than him which is 32 years old for his sister, since his sister is 3 years younger.
Let , smallest integer is x.
So , other one is x + 1.
By , given conditions :

Since, the numbers are positive so, x = -2 is ignored.
Therefore, the numbers are 9 and 10.
Hence, this is the required solution.
16-A 18-B 19-D (not 100% sure on 16)
17²-8²=225
√225= 15
therefore both x and y are 15 ft