D. Given.
My father has given his time, effort, and money to the relief effort.
If a number has 5 as it's last digit, it's always divisible by 5: multiples of 5 have either 5 or 0 as the last digit.
If a number is divisible by 5, it is not a prime with one exception: of 5 itself. This is from the definition of prime numbers: divisible only by 1 and by itself.
Answer:
The answer would be luc, lum, lun & lus. Since they all came from Latin lux, lucis & lume which means all light. Luminary, to bring light to the eye or luminescence which means a giving out of light by a material not coming from heat. Lucent means to produce light. So any word that has those Latin roots can be an invention's name.
Explanation:
Being cheap and making you pay, or on a budget.
