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2 answers:
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Answer:
3.9 mi/h
Step-by-step explanation:
If the boy is rowing perpendicular to the current, the two vectors form a right triangle.
AB represents the downstream current, BC is the speed across the river, and AC is the ground speed of the boat
AC^2 = 2.4^2 + 3.1^2 =5.76 + 9.61 = 15.37
AC = sqrt(15.37) = 3.9 mi/h
The boat's speed over the ground is 3.9 mi/h.
Answer:
The simplified form of the given expression is 12(m -n).
Step-by-step explanation:
The given expression is
We need to simplify the given expression.
Rearrange the terms according to the variables.
On combining like terms, we get
On simplification, we get
Taking GCF common.
Therefore the simplified form of the given expression is 12(m -n).