Question 4 of 10 Which of the following are solutions to the equation below?
Check all that apply.
(5x + 1)2 = 7
Ax=1
B. x= -17-1
x
5
O c. x= 17-1
5
D. x= -1

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

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The anwser cause i do not understand just plez