Question

a. [(-28)-(+42)]-(-13)

b. [(-15)-(-6)]-(-23)

c. [(+45)-(-4)]-(+17)

d. [(+27)-(-18)]-(72)

Answer 1

a. (-28-42) + 13
= -70 + 13
= -57

b. (-15+6) +23
= -9 + 23
= 14

c. (45+4) -17
= 49 - 17
= 32

d. (27+18) -72
= 45 - 72
= -27

Answer 2

a:-57

b:14

c:-32

d:117

$\int\limits^a_b {x} \, dx x^{2} x^{2} \neq \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]$