The numbers 1 through 10 are written on individual cards and placed in a bag. if you reach into the bag and pull out a card, what is the probability that it will be a 7?
the estimated area is 8 square units.
left point: a=x=-1
right point: b=x=2
width of each of the 3 equal rectangles: w=r/3→w=3/3→w=1
first right endpoint is x1=a+w→x1=-1+1→x1=0
second right endpoint is x2=x1+w→x2=0+1→x2=1
third right endpoint is x3=x2+w→x3=1+1→x3=2
estimated area: a≈a1+a2+a3
a≈a1+a2+a3→a≈1+2+5→a≈8 square units
they do have enough to pay for their dinner including dinner tax and gratuity
so they have $30.
their dinner costs $21
taxes are $21 *1.06=22.26
tip is 22.26*1.15=25.599
so they do have enough to pay for their dinner