Answer:
How effective is a new toothpaste in reducing cavities? Observational study
How does the daytime temperature affect the.....- Observational study
Which is a better absorber of heat.... - Controlled experiment
Can plants prepare food even In artificial light.- Controlled experiment
Why does a rolling ball slow down as it moves.- Controlled experiment
Please check if the answers are right first
The answer is the first one
If I remember right I think we would have less gravity am not 100% sure you I think my teacher said something like that last year
Answer:
The inequality symbol is incorrect because she can spend up to and including $65.
The expression 5. 50b + 7. 5 is correct because $5. 50 per book is 5. 50b and that is added to the shipping fee of $7. 50 to determine the total purchase price.
Explanation:
The inequality should be 5.50b + 7.5 ≤ 65 because she can use less than $65 or all $65 to spend on books.
Also, the shipping fee is for all the books she buys combined, not for each individual book so the left side of the inequality should read 5.50b + 7.5.
