Question

Evaluate the expression, using the given value of the variable.  z ÷ 2 – 4z + 3(z – 3) when z = 8  

  A. –17   B. –13   C. –7   D. –1 

Solve for x.   3 • 4 – 3 • 7 = 3(x – 7)   A. 4   B. –10   C. 6   D.         -3

                                                                                                              

Answer 1

`z : 2 - 4z + 3(z - 3)= z\cdot (1)/(2) - 4z + 3 z - 9= -(1)/(2)z -9 \\ \\ z= 8 \\ \\-(1)/(2)z -9 =-(1)/(2) \cdot 8 -9 =-4-9=-13 \\ \\ Answer : \ B. \ \ -13`




`3 \cdot 4 - 3 \cdot 7 = 3(x - 7) \\ \\ 12-21 =3x-21\\ \\3x =12-21+21\\ \\3x=12 \ \ /:3\\ \\ x=4 \\ \\ Answer : \ A. \ \ 4`