Grade 7. mathematics: integers.
can anyone me answer this questions? i want the correct answers. no guessing or i think.

evaluate each expression.
a.) ( -6 )
=

b.) - 4 + (-8)
=

c.) 3 + 4 + (-5)

evaluate each expression.
hint: when we do subtraction change it to an addition of the opposite! keep, change, change.

a.) -3 - 10
=
b.) 8 - (-12)
=
c.) 5 – 9

the melting point of mercury is -36 degrees f and its boiling point 672 degrees f.
what is the difference between the boiling point and the melting point?
the expression i would use to solve this is: ?

the difference is : ? degrees f ?

a man enters an elevator at the first floor of a building.
he takes the elevator up 10 floors, down 3, up 11, and then down 20 to the basement.
how many floors below the first floor is the basement?

hint: think about when he goes up floors, are those numbers positive or negative? and when he goes down floors, are those numbers positive or negative?

expression:

10 + ? + ? + (-20) = ?

so now i solve the mathematical expression by combining those values.
the answer to my expression is :

my solution is that the basement is how many floors below the first floor ?

the balance in your bank account is currently $350.00.

hint: paying a bill is subtracting from the balance. deposit is adding to a balance.

you pay a credit card bill for $250.00. now what is your bank account balance is ? $

you get a check from grandma for $30.00 for your birthday that you deposit into your account. now what is your account balance is ? $

next you pay a bill for $120.00 and also pay a second bill for $50.00.
now what is your final and current balance is ? $