Answer:
He did not control for lurking variables and their impacts on the results of his experiment. Amount of sunlight and water received are two outside variables(or confounding variables) that may impact the growth of his plants and influence the results. He needs to apply the same amount of sunlight and water to each plant within a different planting soil in order to rule out the influence of those two variables and test the sole effect of the soil brand on the plant growth. Otherwise, it would be hard to determine whether his plant growth was because of the soil brand or the different amounts of sunlight and water received
Answer:
what is the question
Step-by-step explanation:
(x+7)(x+2)=66
x²+9x+14=66
x²+9x-52=0
(x-4)(x+13)=0
x=4 or x=-13
x cannot be negative, so the only answer is x=4
the length is 11 and the width is 6
Get a common denominator, in this case, we can use 40
multiply the numerator and denominator of each fraction to get the common denominator equivilent
1/2*20= 20/40
3/5*8= 24/40
1/8*5= 5/40
now add the numerators together
20+24+5= 49/40 or 1 and 9/40
add the whole numbers
24+32+44= 100
add the previous numbers
101 and 9/40