Let x be the set of the 26 lowercase english letters and 10 decimal digits. how many x-strings of length 15 satisfy all of the following properties (at the same time)?

a. the first and last symbols of the string are distinct digits (which may appear elsewhere in the string).
b. precisely four of the symbols in the string are the letter ’t’.
c. precisely three characters in the string are elements of the set v fa; e; i; o; ug and these characters are all distinct.

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1  

your answer is the last one

step-by-step explanation:

divide the length of a'c' by the length of ac to get a scale factor of two

& then reflect vertically (over the y-axis)

so your answer is dilation by a scale factor of 2 followed by reflection over the y-axis

10000000000000000000000000000000

yrguevfytbrtuyr4

step-by-step explanation:

tduressqwzyx86diyvkghvtufvgycyvgtytc4