Help please? (61 + 5) ÷ 6 − 22

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?

The owner of a coffee shop compared the amount of hot coffee per day, in fluid ounces, sold and the daily high temperatures, in degrees fahrenheit, per day. her data are shown in the scatter plot below