Let's say David's age right now is x years
x + 6 = 2(x - 7)
x + 6 = 2x - 14
x = 20
Therefor David is 20 years old
To do this multiply 1 by 4, then 3 by 5. 4 over 15 is your answer.
<span>4x^2 - 25
= (2x)^2 - 5^2 .................using a^2 - b^2 = (a+b)(a-b)
= (2x + 5)(2x - 5)</span>
Answer:
37/50=74/100
Step-by-step explanation:
The first one and the second one are the correct sums
