Answer: 17.5
Step-by-step explanation:
7:10 = x:25
times both sides by 25
25(7/10) =x
than solve for x
X = 25 × (7/10)
X = 17.5
The number of permutations can be made of the letters of the word "radar" when taken all at a time is 30.
This is defined as ways in which n things can be arranged, taken all at a time.
P(n,r) = n!/(n-r)!
Radar has 5 words with 2r , 2a and 1d which means
5! / 2! 2! 1!
5! = 5×4×3×2×1 = 120
2! 2! 1! = 4
120/4 = 30
Read more about Permutation here brainly.com/question/1216161