Set up a proportion:
5/200 = 7/x
Cross multiply:
200 * 7 = 5 * x
1400 = 5x
Divide 5 to both sides:
x = 280
Answer:
The first option:

Step-by-step explanation:
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Answer:
B
Step-by-step explanation:
If you distribute the numbers in the parenthesis (which means to multiply the outside number once with each inside number), then it should come up looking like the equation above.
Answer:
4.443664/2
Step-by-step explanation:
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Answer:f
(
x
)
−
1
=
√
x
+
2
Step-by-step explanation: