Final answer:
Carla reads at a rate of one page per 2.5 minutes; therefore, she will take 50 minutes to read all 20 pages of her assignment.
Step-by-step explanation:
Carla needs to complete her science homework, which includes reading 20 pages and answering 14 questions. Since it takes her 10 minutes to read 4 pages, we can calculate the total time she needs to read all 20 pages with a proportion:
First, we find the rate at which Carla reads: 10 minutes for 4 pages, so she reads 1 page in 10 / 4 = 2.5 minutes.
Next, we multiply this rate by the total number of pages she has to read:
2.5 minutes/page × 20 pages = 50 minutes
Therefore, it will take Carla 50 minutes to read the full assignment.