write each phrase as an algebraic expression. use the variable x to represent each unknown number. twelve, minus three times a n
1 answer:
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Two equal triangles
2(1/2×b×h)
=2(1/2×8×10)
Three rectangles
=3(l×h)
=3(18×8)
=3(144)
Total Surface area
Answer:
The answer is B.
Step-by-step explanation:
Given that the total angles in a triangle is 180° so in order to find the value of x, you have to substract 60° and 80° from 180° :