Evaulate A+7 when a=4

What is the perimeter of square abcd? units units 28 units 37 units

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¯¯¯¯¯¯¯¯)?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?