Question

a) 13 - 18 - (-42) -15

b) 369 - 4[(-5) + 4 . (-8)]

c) (-8)³ : (-8)² + 8

d) (-12) . (-13) + 13. (-29)

Answer 1

\(a,13-18-\left(-42\right)-15\)

\(=13-18+42-15\)

\(=\left(13-15\right)-\left(18+42\right)\)

\(=-2-60\)

\(=-62\)

\(b,369-4\left[\left(-5\right)+4.\left(-8\right)\right]\)

\(=369-4\left[\left(-5\right)+\left(-32\right)\right]\)

\(=369-4.\left(-37\right)\)

\(=369-\left(-148\right)\)

\(=369+148\)

\(=517\)

\(c,\left(-8\right)^3:\left(-8\right)^2+8\)

\(=-512:64+8\)

\(=-8+8\)

\(=0\)

\(d,\left(-12\right)\left(-13\right)+13.\left(-29\right)\)

\(=156+-377\)

\(=156-377\)

\(=-221\)