Answer:
so basically
the area of the square; (5cm)^2 = 25cm^5
the area of the triangle; (4cm.5cm)/2 = 10cm^2
which means that r = √25cm^2/10cm^2 = √25/10 cm^2 or √10/25 cm^2
english is not my first language so i do not know what combined means but if u explain a little more i will try to help u
-> ok edit edit;
1cm/5in. = r
5cm => 25in.
z^2= area of a square so
25in.25in= 625 in^2
4cm => 20in.
5cm => 25in.
h.b/2 = area of a triangle so
20in.25in./2 = 250in.^2
250in.^2 + 625in.^2 = 875in.^2
so answer B
Answer:

Step-by-step explanation:
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Given:

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Combine like terms.

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Add 12 to both sides.

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Divide both sides by 9.

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Hope this is helpful.
Step-by-step explanation:
(4,-30) i am not 100% sure about it.
Answer:
D.
Step-by-step explanation:
If you follow the pattern, four boxes should use 21 toothpicks.