Step-by-step explanation:
Initial velocity ,<u>u=</u><u> </u><u>1</u><u>4</u><u> </u><u>m/</u><u>s</u>
<u>a </u><u>=</u><u>_</u><u>g</u>
<u>=</u><u> </u><u>9</u><u>.</u><u>8</u><u> </u><u>m/</u><u>s </u>
velocity at highest point,<u>v</u><u>=</u><u>3</u><u>0</u><u> </u><u>m/</u><u> </u><u>s</u>
<u>=</u><u>2</u><u>a</u><u>s</u><u>=</u><u>v </u><u>sqare </u><u>_</u><u>u</u><u> </u><u>square</u>
<u>=</u><u>s=</u><u> </u><u>3</u><u>5</u><u>.</u><u>9</u><u>9</u><u> </u><u>m</u>
5.5
Step-by-step explanation:

The interquartile range (IQR) is the difference between quartile 3 and quartile 1. In this data set the IQR = 6
4,5,6,6,7,8,9,9,10,10,12,12,14,15
Q1 = 6
Q2 = 9
Q3 = 12
IQR = Q3 - Q1 = 12 - 6 = 6
Answer:

Step-by-step explanation:
Given
← factorise numerator and denominator
2x² - 18 ( factor out 2 from each term )
= 2(x² - 9) ← difference of 2 squares
= 2(x - 3)(x + 3)
and
x² + 4x - 21 = (x + 7)(x - 3) , then
=
← cancel common factor (x - 3) on numerator/ denominator
= 
"Dividing<span> by </span>fractions<span> is just like multiplying </span>fractions<span>, except for one additional step. To </span>divide<span> any number by a </span>fraction<span>: First step: Find the reciprocal of the </span>fraction<span>. Second step: Multiply the number by the reciprocal of the </span>fraction<span>." -Google</span>