Substitution
x = 5. y = 2
x + 9 - y
12
a + 5a + 9a + 7a
22a
Ricky is now 14 years old. How old was he x years ago?
14 - x
4 more than c
c + 4
1.7 + 15.4=
17.1
y = 6 x = 4
3x + 2y
24
7a + 6 + 3a + a
11a + 6
Laia has a water bottle, she drank 2L. If it originally had x amount of liters, how much does it have now?
x - 2
p x q + r
pq + r
0.4 x 0.03=
0.012
x = 7
3(2x +1)
45
7x + 2a + 5a - 6x
x + 7a
Laura buys a apricots and p peaches. Find the total cost (in dollars) if each apricot cost 60 cents and each peach cost 90 cents.
0.6a + 0.9p
w - y x 8
w - 8y
24 + 52 + 32=
50
x = 6. y = 3
7x - 4y
30
6x + 2x - 9x - 5a - 2a
-x -7a
There were 20 people at a party, the m more people arrived and n people left. How many people are at the party now
20 + m - n
Martin is x years old. Jennifer is 3 years younger than Martin. Connor is twice as old as Jennifer. What is Connor's age
2x - 6
3(2x + 5) + 7(3x + 1)
27x + 22
x = 7. y =-2
6(2x + 5y)
24
5x - 6y + 3a - 7x + 4y - 9a
-2x -2y -6a
Frank buys b balls at $m each and r racquets at $n each. Find the total cost of the items.
$bm + $rn
Martin is x years old. Jennifer is 3 years younger than Martin. Connor is twice as old as Jennifer. Write a sum for all three ages.
4x - 9
How many prime numbers are there less than 20?
8 prime numbers
2, 3, 5, 7, 11, 13, 17, 19