A rectangle has a width of 9 units and a length of 40 units. What is the length of a diagonal?
A. O 31 units
B.0 39 units
C.041 units
D.49 units

98 point question what is the record for most points in one

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota