Is the function f(x) =(9/10)^x an exponential function if so identify the base if not why not?

yes, base = 9

no, the exponent is not variable.

yes, base =9/10

no, the base is not a positive real number not equal to 1.

On the first of each month, shelly runs a 5k race. she keeps track of her times to track her progress. her time in minutes is recorded in the table: jan 40.55 july 35.38 feb 41.51 aug 37.48 mar 42.01 sept 40.87 apr 38.76 oct 48.32 may 36.32 nov 41.59 june 34.28 dec 42.71 determine the difference between the mean of the data, including the outlier and excluding the outlier. round to the hundredths place. 39.98 39.22 0.76 1.21

Type the correct answer in each box. spell all the words correctly, and use numerals instead of words for numbers. if necessary, use / for the fraction bar(s).

Acircle has a radius of 12.6cm what is the exact length of an arc formed by a central angle measuring 120