Solve the equation.
(x - 21) + 
(x + 4) = x - 9
A. 
B. 
C. 
D. 
Answer: D
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How far from the base of a building must a 26-ft ladder be placed so that it reaches 10 ft up the wall? ? __________ ft
Fill in the blank(s) with the appropriate word(s).
Provide an appropriate response.Suppose you want to solve the following problem. A teacher can grade 7 essays in 2 hours. At this rate, how many essays will she be able to grade in 5 hours? Which of the following proportions will give the correct answer?(i) 
= 
(ii) 
= 
(iii) 
style="vertical-align: -17.0px;" /> = 
(iv) 
= 
A. (iii) only
B. (ii) and (iv)
C. (i) and (iv)
D. (i) only
Calculate.
Enter your answer as a(eb ± ec). Any fractions in reduced form 
.
What will be an ideal response?
The improved Euler's formula for solving 
, 
is
Select the correct answer.
?
A. 
,
,
B. 
,,
C. 
,,
D. 
,, where
is predicted from Euler's formula
E. 
, , where is predicted from Euler's formula