40×4×4=640
b=20 h=4
using formula:
1/2×base×height
1/2×20×4=40
its says scale by factor 4:
b=80 h=16
using formula:
1/2×base×height
1/2×80×16=640
answer------>>>>640cm^2
Answer:
4y + 28
Step-by-step explanation:
I simply distributed the 4:
1. 4(y+7)
2. 4 times y = 4y
3. 4 times 7 = +28
4. 4y + 28
Cross multiply
(x-6)(x+3)=x²-6x+3x+18=x²-3x+18
(x+7)(x+5)=x²+7x+5x+35=x²+12x+35
that means the inequality is
x²-3x+18≥x²+12x+35 which simplifies to
<em>—17≥15x or 15x+17≤0</em>
