The composite figure is made up of two congruent
rectangular pyramids joined at their bases.
What is the total volume of the composite figure?
30 units
60 units
120 units
180 units
6
2
12
7.5

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

there are no answer choices

step-by-step explanation:

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step-by-step explanation: