1. In a quiz team A scored -30, 20, 40, -15 and team B scored -40, -20, 30,25 in four sucoessive rounds. Which team scored more?

2. Write down a pair of integers whose:
a) Sum is -30
b) Difference is -15
c) Multiplication is 40
d) Multiplication is -40

3. Find the product using suitable properties
a) 25 x (-19) + (-19) x 5
b) (-81) x 20 + 81
c) 6 x (40 – 5)
d) (-125) x 29 x 4
e) (-19) x (-49)

4. Verify the following:
a) 15 x [8+(-2)] = 15 x 8 + 15 x (-2)
b) a= 28, b= 81, then a-(-b) = a+b.

5. In a class test containing 20 questions, 4 marks are given for every correct answer and (-2) marks are given for every incorrect answer. a) Evan attempts all questions but only 18 of her answers are correct. What is her total score? b) One of her friends gets only 10 answers correct. What will be her score?

6. Anna is a microbiology student. She was doing research on optimum temperature for the survival of different strains of bacteria. Studies showed that bacteria X need optimum temperature of -31⁰C while bacteria Y need optimum temperature of -56⁰C. What is the temperature difference?

1)

Team A scored 15 while Team B scored 5 so Team A scored more.

2)

a) -20 and -10

b) -10 and +5

c) 20 and 2

d) -10 and 4

3)

a)-570

b)-1539

c)210

d)-14500

e)931

4)

I don't understand the question (sorry)

5)

a) 18*4=72

72+(-4)=68

b) 20

6)

-25

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

$97520

step-by-step explanation:

add 6% to the value she got from selling the house.