Answer:
Step-by-step explanation:
we know that: 1 yard = 3 ft
therefore,
9 yards = 3 * 9 ft = 27 ft
(9 yards 1 foot) - 8 ft
= (27 ft + 1 ft) - 8 ft
=28 ft - 8ft
= 20 ft
-5 + (8 x -7)
using PEMDAS, (8 x -7) = -56
so -5 + -56 = -61
640,121
he is 11 years old