Answer:
10 black marbles
Step-by-step explanation:
Let black marbles be=2x
Then white marbles=5x
Total marbles=7x which in turn is equal to 35. Hence x=5
Black marbles=2*5=10
H2H
Answer:
I think is c
Step-by-step explanation:
Answer: Observational study
Step-by-step explanation: I just took the test
Isn’t there supposed to be a picture?
The perimeter of each is the sum of the lengths of its sides.
Triangle Perimeter = 16 + 4x-3 +3x = 7x+13
Square Perimeter = 2x +2x +2x +2x = 8x
If these are equal, you have

The length of a side of the square is 26 units.