Answer:
its (420) because (listed below)
Step-by-step explanation:
The traingular is pointing down left and 420 and the angle towards down left. Your welcome!
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I believe that the answer is 1845
the surface area of the cube is 1350
the surface area of the pyramid is 495
the total surface area is :

good luck
Area of rectangle = l × b
l = 70cm
b = 8cm
Area = 70 × 8 = 560cm²
Area of rectangle = l × b
l = 78cm
b = 15cm
Area = 78 × 75 = 1170cm²