Can someone me solve number 20.) show work as well .

There are 5 topics but she has to use 2 different ones. Therefore she has to choose one of the topics out of 20 different mix options.

1/5 x 1/4 = 1/20

(the first topic out of the five) x (the second topic out of four because there is only four topics after choosing the first already)=answer

93.8

step-by-step explanation:

lets say, first number = x

second number = 3x+7

total = 49

(x)+(3x+7)= 49

4x+7 = 49

4x = 42

x = 42/4

x= 10.5

x= 10.5

3x+7 = 3(10.5)+7 = 93.8

hope this