Answer:
9
Step-by-step explanation:
10 - 1 = 9
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
if we erase 10, we have 9. Try that when subtracting 1 - any number
question 1 is congruent. 2 is not congruent and 3 is congruent
60
you multiply 150*4 then divide that by 10 and that's your answer
