Answer:
C
Step-by-step explanation:
Given the complex number a ± bi, then the complex conjugate is
a ∓ bi
Note the real part remains unchanged while the sign of the imaginary part is reversed, thus
The conjugate of 7 - i is 7 + i → C
Answer:
9
Step-by-step explanation:
1.2+d+0.4=9.7
1.6+d=9.7
-1.6. -1.6
D=8.1
Answer:
169 cm^2
Step-by-step explanation:
Right surface (rectangle)
A = LW = 7 cm * 5 cm = 35 cm^2
Left surface (hidden rectangle)
A = LW = 7 cm * 5 cm = 35 cm^2
Bottom surface (hidden rectangle)
A = LW = 9 cm * 5 cm = 45 cm^2
Front face = back face = 2 * triangle
A = 2 * bh/2 = 2 * 9 cm * 6 cm/2 = 54 cm^2
total surface area = 35 cm^2 + 35 cm^2 + 45 cm^2 + 54 cm^2 = 169 cm^2