Robert says the expression 2+3 times 7 and 2+(3 times 7) have the same value. is robert correct? explain your answer and evaluate each expression

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¯¯¯¯¯¯¯¯)?

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

You are designing a rectangular pet pen for your new baby puppy. you have 30 feet of fencing you would like the fencing to be 6 1/3 feet longer than the width