Which situation can be represented by the expression 3 + (-7) plus, left parenthesis, minus, 7, right parenthesis.
1 answer:
Options:
(A) . A football team lost 3 yards on one play. The team gained 7 yards on the next play.
(B ). A football team gained 3 yards on one play. The team lost 7 yards on the next play.
(C). A football team gained 3 yards on one play. The team gained 7 yards on the next play.
Answer:
(B ). A football team gained 3 yards on one play. The team lost 7 yards on the next play.
Step-by-step explanation:
Given
Required
Which situation does it represent?
First, we simplify the expression as follows:
Remove brackets
Express each term with their signs
<u>Analysing each term;</u>
In terms of the list of given options,
+3 means a gain of 3 yards
-7 means a loss of 7 yards
<em>Hence, B. is correct</em>
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Answer:
12 miles per hour
Step-by-step explanation:
Let speed of boat in still water be "x"
and speed of current be "c"
So, downstream rate would be "x + c"
And, upstream rate would be "x - c"
Now, given c = 4
We can use the distance formula, D = RT, where
D is distance, R is rate, and T is time
to solve this.
Downstream:
D = RT
92 = (x+4)(t)
Upstream:
D = RT
46 = (x-4)(t)
Both the times are same, we can equate both the times. Lets simplify first:
t = 92/(x+4)
and
t = 46/(x-4)
Equate:
Now, cross multiply and solve for x to get our answer:
Speed of Boat (in still water) = 12 mph