" the sum " means add
16 + x = 20 <= ur equation
x = 20 - 16
x = 4 <== the number
Answer: a) Explicit formula :
b) Recursive formula :
and 
Step-by-step explanation:
Since we have given that
Number of grams of yeast in a culture dish initially = 9 grams
According to question, a certain culture of year increases by 50 % every three hours.
So, the explicit formula will be

And the recursive formula will be

Hence, a) Explicit formula : 
b) Recursive formula :
and 
2/3*1860= 1240
2/3 is equal to 66 2/3 %
The answer is A since: 3^2+4^2=5^2
25=25
26% of 750 packs of gum contained mint-flavored gum
Step-by-step explanation:
To solve for percentages you have to divide 195/750
To learn how to solve for decimals from fractions use this video:
yt.com/watch?v=guBVW5PiHLs (use the full link instead of yt)
195 divided by 750 is 0.26
To make a number into a fraction you have to move the decimal two spots to the right to make the number into 26.00 (26)
That means 195 out of 750 is 26%