Hello,
let's assume j the john's age, m the mary's age.
<span>"John is twice as old as mary"==>j=2*m
</span>
<span>"the sum of their ages is 21" ==>j+m=21
==>2*m+m=21
==>3m=21
==>m=7
and j=21-7=14
</span>
Answer:
D.)
Step-by-step explanation:
(3x4)/2 = 6
(3x4)/2 = 6
5x11= 55
4x11= 44
3x11= 33
= 146
Answer:
A=45m²
Step-by-step explanation:
A=bh=9·5=45m²
Answer:
w + 2.56 ≥ 10.24
Step-by-step explanation:
The least w + 2.56 could be is 10.24 which means that w + 2.56 could be more than 10.24
For no. 12 the car is not moving between 3 and 4
