Diagonal matrix has the elements shown below. &11 = 16
az2 =-8.7
az3 = 5.4
244 = 1.3
a 55 =-6.9
Which is the diagonal matrix containing these elements?

Combine like terms to make a simpler expression 3z+z

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?