PLEASE TELL HOW TO DO QUESTION NUMBER 4,5 AND 6

PLEASE ANSWER ME FAST

Dear student
(a) -13-11=1311(b) 45-40=4×9-4×8=-98(c) 51-13=-5113(d) -28-12=2812=4×74×3=73
Please ask remaining questions in different threads.
Regards

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