Please complete in the back of your book and show all working.
I have given you examples of excellent answers for 1)a and 2)a
Title: Formulas
1)
a What is 5 + 6w equal to when w = 2?
Excellent answer :
5 + 6w = 5 + (6 x 2) = 5 + 12 = 17 (use the same method for the other questions)
bWhat is 6 + 3t equal to when t = 3?
c What is 2w + 5 equal to when w = 2?
d What is 2 + 15d equal to when d = 3?
e What is 17 + 3r equal to when r = 6?
2)
A window cleaner uses the following formula:
C = £5 + 2w
where
C = cost in £
w = number of windows
Calculate how much the window cleaner charges to wash the following number of windows:
a 3 windows
Excellent answer:
C = £5 + 2w and w = 3 (as we have 3 windows)
C = 5 + (2 x 3) = 5 + 6 = £11 (use the same method for the other questions)
b 6 windows
c 9 windows
3)
A dentist uses the following formula:
C = £15 + 20t
where
C = cost in £
t = number of teeth removed
Calculate how much the dentist charges to remove the following number of teeth:
a 1 tooth
b 3 teeth
c 4 teeth
4)
A formula for renting a car is :
C = £46 + 24d
where
C = cost in £
d = number of days
Calculate how much it costs to rent a car for the following number of days:
a 2 days
b 4 days
c How much more expensive is it to rent a car for 6 days compared to 4 days?
