Here is a rectangle. 1. Explain why the area of the large rectangle is 2a + 3a + 4a.
2. Explain why the area of the large rectangle is (2+3+4)a. a
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Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.

Jorge wants to determine the enlarged dimensions of a digital photo to be used as wallpaper on his computer screen. the original photo was 800 pixels wide by 600 pixels high. the new photo will be 1,260 pixels wide. what will the new height be?

What is the distance between the points (2, 5) and (5,9)?