Find the sum of the numbers. Express your answer in scientific notation. (1.83 times 10 Superscript 13 Baseline) + (6.4 times 10 Superscript 11)

6.4183 times 10 Superscript 11
8.23 times 10 Superscript 12
1.894 times 10 Superscript 13
2.471 times 10 Superscript 13

We have enough material to build a fence around a station that has a perimeter of 180 feet the width of the rectangular space must be 3 1/4 feet what must the length be

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¯¯¯¯¯¯¯¯)?

Jermaine has t subway tokens. karen has 4 more subway tokens than jermaine. raul has 5 fewer subway tokens than jermaine. which expression represents the ratio of karen's tokens to raul's tokens