unit = rational numbers
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a. 2/-7 + 4/8 + -5/4= -34/56
Step-by-step explanation:
a.= 2/-7 + 4/8
=2×(-1)/-7×(-1) (make the denominator positive)
=-2/7 + 4/8 (make the denominators equal)
= MULTIPLES OF 7 =7,14,21,28,35,42,49,56,63,70
=MULTIPLES OF 8 =8,16,24,32,40,48,56,64,72,80
=LOWEST COMMON MULTIPLES(LCM) OF 7 AND 8 =56
=-2×8/7×8 =-16/56
=4×7/8×7 =28/56
= -16/56 + 28/56 (ADD THE NUMERATORS)
=-16+28=-34
=-34/56 ANSWER
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hope it helps you
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