Which best describes how to add 9.73 and 21.6?
a. align the digits on the left digit.
add from left to right, regrouping as necessary.
b. align the digits on the right digit.
add from right to left, regrouping as necessary.
c. align the digits on the decimal point.
add from left to right, regrouping as necessary.
d. align the digits on the decimal point.
add from right to left, regrouping as necessary.

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true