Question

day high temperatre (relative to average, °f) wednesday -4.1 thursday +3\frac{1}{4} °f warmer

Explanation:

Step1: Analyze the values

A negative value for Wednesday (-4.1°F) means it is 4.1°F below the average temperature. A positive value for Thursday ($+3\frac{1}{4}=3.25$°F) means it is 3.25°F above the average temperature.

Step2: Compare the values

Since - 4.1 < 3.25, Thursday has a higher temperature relative to the average. To find the difference in how much warmer Thursday is than Wednesday, we calculate the difference between the two values.
We subtract the temperature - related - to - average of Wednesday from that of Thursday: $3.25-(-4.1)$.
Using the rule $a - (-b)=a + b$, we have $3.25+4.1 = 7.35$°F.

Answer:

7.35