A gold bar has a trapezium cross-sectional area. Gold has a density of 19.3 grams per cm^3 work out the mass of the gold bar in kg

Step-by-step explanation:

step 1

Find the volume of the trapezoidal prism

The volume of the prism is equal to

where

B is the area of the trapezoidal face

L is the length of the prism

Find the area of the base B

we know that

The area of a trapezoid is equal to

we have

substitute

step 2

Find the mass

Remember that

The density is equal to divide the mass by the volume

so

we have

substitute

solve for the mass

Convert to Kg

Remember that

therefore

i believe the answer is c.

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7