Question

1. evaluate:

a) -3 + (-2)
b) 2 + (-3)
c) -8 + 8
d) -6 - 4
e) (-4)-(-3)
f) 2 + (-6)
g) 5 + (-7)
h) -3 + 4 - 7
i) -8 - (-4) - (+4)
j) 4 + (-15) - (-15)
k) -4 - 5 - 6
l) -7 - 7 + (-7)

1. circle the expression that has the greatest value:

option 1: -5 - 3 + 4
option 2: 4 - 3 - (-4)
option 3: 5 - (-3) - 10

1. the temperature in red rock is 4°c. what is the temperature after a rise of 5°c followed by a fall of 10°c?

Explanation:

Step1: Solve part 1 problems

a)

-3 + (-2) = -3 - 2 = -5

b)

2+(-3)=2 - 3=-1

c)

-8 + 8 = 0

d)

-6-4=-10

e)

(-4)-(-3)=-4 + 3=-1

f)

2+(-6)=2 - 6=-4

g)

5+(-7)=5 - 7=-2

h)

-3 + 4-7=1 - 7=-6

i)

-8-(-4)-(+4)=-8 + 4-4=-8

j)

4+(-15)-(-15)=4-15 + 15=4

k)

-4-5 - 6=-9 - 6=-15

l)

-7-7+(-7)=-7-7 - 7=-21

Step2: Solve part 2 problems

Option 1

-5-3 + 4=-8 + 4=-4

Option 2

4-3-(-4)=4-3 + 4=1 + 4=5

Option 3

5-(-3)-10=5 + 3-10=8 - 10=-2
Since 5 > -2 > -4, Option 2 has the greatest value.

Step3: Solve part 3 problems

Starting temperature is 4°C. After a rise of 5°C, the temperature is 4 + 5=9°C. Then after a fall of 10°C, the temperature is 9-10=-1°C.

Answer:

1. a) -5; b) -1; c) 0; d) -10; e) -1; f) -4; g) -2; h) -6; i) -8; j) 4; k) -15; l) -21
2. Option 2: 4 - 3 - (-4)
3. -1°C