The answer is unreasonable because the value of x is between 2 and 3.The error is : she did not introducing logs in solving the equation.
Step-by-step explanation:
The question is 
Here answers is unreasonable because, she can test with powers of seven like;
7²=49
7³=343
So this means the value of x lies between 2 and 3, so here answer 11.71 is unreasonable
b) In this case, to solve the equation, introduce logs both sides
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Keywords :Equation, error
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I believe Groceries is since groceries can be changed and prices can be altered more easily than the other three options. Can't explain that well, hope I helped!
The answer is 820 (520+300)
Find the area of the square first
Area = Length x Width
Area = 12 x 9
Area = 108
Find the area of the right triangles
Area = 1/2(Length x Base)
Area = 1/2(9 x 2)
Area = 1/2(18)
Area = 9
Since there is 2 triangles multiply by 2
9 x 2 = 18
Now add
108 + 18 = 126
126 is your area
Let's eliminate x. Mult the first eq'n by 4, obtaining
-4x + 8y = 36
Now add the 2nd equation to this result:
-4x + 8y = 36
4x + 5y = 3
--------------------
13y = 39, so y = 3.
Subst. 3 for y in the 2nd equation and solve the result for x:
4x + 5(3) = 3 => 4x = -12 => x = -3. Solution is (-3,3).
