7. The temperature of a cup of coffee decreases by \( 20 \% \) every minute. If the initial temperature is 80 degrees Celsius, what will be the approximate temperature after 5 minutes? A. 20 degrees Celsius B. 26 degrees Celsius C. 32 degrees Celsius D. 64 degrees Celsius

Valuate \( \sum_{k=1}^{8}(-1)^{k+1} 3 k \)

19. Find all the possible values of the missing digit(s) represented by \( (*) \) a) \( 2 * 6,8 * 71,8 * 919 \) are divisible by 11 .

Sakshi bought \( 1 \frac{2}{3} \mathrm{~kg} \) of pulses and Nikita bought \( \frac{3}{4} \mathrm{k} \) much total quantity of pulses did they both buy? \( \begin{array}{lll}\text { N. } 4 \frac{1}{12} \mathrm{~kg} & \text { B. } 3 \frac{1}{6} \mathrm{~kg} & \text { C. } 4 \frac{2}{3} \mathrm{k}\end{array} \)

A car was valued at \( \$ 34,000 \) in the year 1990 . The value depreciated to \( \$ 11,000 \) by the year 2006 . A) What was the annual rate of change between 1990 and 2006 ?

During the month of January, "ABC Appliances" sold 51 microwaves, 22 refrigerators and 34 stoves, while "XYZ Appliances" sold 36 microwaves, 27 refrigerators and 24 stoves, During the month of February, "ABC Appliances" sold 47 microwaves, 31 refrigerators and 25 stoves, while "XYZ Appliances" sold 50 microwaves, 34 refrigerators and 18 stoves, a. Write a matrix summarizing the sales for the month of January, (Enter in the same order that the information was given.) b. Write a matrix summarizing the sales for the month of February, (Enter in the same order that the information was given.)