The distance h a body will move in a free fall is expressed by the formula h = 1/2 gt 2. if g = 980 cm per sec per sec and t = 20 sec, the distance h is

 196000 cm

Step-by-step explanation:

Here, the given formula,

Where, g is the gravitational acceleration,

t is the time in second,

Here, g = 980 cm per sec  and  t = 20 seconds,

Therefore,

Thus, the required height = 196000 cm

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40

the 3rd on is correct

step-by-step explanation: