80 * 3.5 = 280
she travels around 280km in 3.5 hours.
40% from 25 is:
25 * 40% =
= 25 * 40/100 =
= 25 * 4/10 =
= 25 * 0,4 =
= 10
Another way is to find 1% of 25 and then multiply it by 40:
25 * 40% =
= (25 / 100) * 40 =
= 0,25 * 40 =
= 10
You set up the problem correctly, just keep going.
Expand out your expression:
2x(3x-9) + 4x(x+13)
= 6x^2 -18x + 4x^2 + 52x
= 10x^2 +34x
Remember that the above expression is the area, so it is equal to 24.
10x^2 + 34x = 24
10x^2 + 34x - 24 = 0 (divide by 2)
5x^2 + 17x - 12 = 0
Done.
Answer:
Step-by-step explanation:
2
