The sum of 43.9 and a number is 49.65, as shown below. what number should go in the box to complete the addition problem? 43.9 plus box.75 equals 49.65

5

Step-by-step explanation:

The sum of 43.9 and a number is 49.65

First make equation using given phrase

Let number be x

"sum of 43.9 and a number" ⇒ 43.9 + x

43.9 + x  is 49.65

Therefore, 43.9 + x = 49.65

Now solve for x

43.9 + x = 49.65     [ subtract 43.9 both sides ]

          x = 49.65 - 43.9

          x = 5.75

Expression:  

43.9 + ?.75 = 49.65

          ↓

43.9 + 5.75 = 49.65

So, ? = 5

Hence, 5 will go in the box

answer:

c. the third graph

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.