1AHt Letter formulas

• Wiskunde
• Middelbare school
• havo
• Leerjaar 1

1. calculate :

calculate 6b
for b = 5

1. 65
2. 11
3. 30
4. 5b

2. Calculate :

calculate 6b + 10
for b = 5

1. 40
2. 21
3. 65
4. 20

3. Calculate :

Calculate a + 20
for a = -4

1. 24
2. 5
3. 80
4. 16

4. Calculate :

calculate 12c + 4
for c = -2

1. 28
2. -20
3. -6
4. -28

5. calculate 2a for a = 7

Give only final answer

6. calculate 2(a-2):2 for a = 6
give only the final answer

Name the letter of a point
that is not a roster point

Linda is doing some DIY work. She rents a saw. The cost can be calculate with:
amount in euros = 21 * amount of days + 7,50
Linda rents the saw for 6 days.
What are the fixed costs?

1. amount in euros
2. 21
3. 7,50
4. amount of days

A visit to an amusement park cost money. The admission fee is 15 euros and each attraction costs 2.50 euro
The word formula is...

1. amount = 15 + 2,5 x number of attractions
2. amount= 2,50 + 15 x number of attractions

Make this word formula into a letter formula

distance = 10 + 6 x time

1. t = 10 + 6 x a
2. 10 + 6 x 5 = 40
3. a = 10 + 6 x t
4. 16 x t = a

Word formula
income in euros = 5,50 + 0,75 x number of kg
how much do you earn at 10 kg?

1. 7,50 euros
2. 5,50 euros
3. 13,00 euros
4. 2 euros

At Filmoké you can rent movies.
Membership costs €6,- per month
Members pay € 3,50 per movie
Which is the letter formula to calculate the costs?

1. B = 6 + 3,5f
2. B = 3,5 + 6f
4. I don't know

At Filmoké you can rent movies. The costs are calculated with the following formula:

B is costs per month and f= number of movies
you are going to rent 2 films, What do you have to pay?

B=6+3,5⋅f.

1. 7 euros
2. 2*3,50= 7 euros
3. f=2 B=6+3,5*2=13 euros
4. I don't know

How many roster point are there in this figure