Answer:
2.16 s
Step-by-step explanation:
When it hits the ground, height h=0 hence



Using quadratic formula

Since time can't be negative, 
t=2.16 s
Answer:
$337.5
Step-by-step explanation:
4:5=360:x 360/4=90 90+360=450 check 360/450=0.8 and 4/5=0.8
4:5=360:450
larger farm perimeter is 450 yards so dig a trench 0.75 per yard
so 450 * 0.75 = $337.5
Hope this helps! :)
Answer:
0.3×
Step-by-step explanation:
0.3×
=30000
Ok so first I am assuming you ment 2 sevenths so 12 divided by 2 sevenths is 42. so the father is currently 42. so when she was 10 he was 40. since 10 is 4 times 40 that is the age we need. so 42 minus 40 is 2. therefore the answer is 2.