25 mina is testing different types of heat lamps to determine which type is most effective for growing strawberry bushes. she purchases two different types of lamps from a local store. mina applies brand a to one area of the yard and brand b to another area of the yard, both of which receive full sunlight. she waters the area with brand b daily; she waters the area with brand a every other day. at the end of the study, mina concludes brand b is more effective in growing strawberry bushes. is mina's conclusion valid? explain why or why not.

No, her conclusion is not valid.

Step-by-step explanation:

In order to determine whether 1 lamp is more effective than the other, all other variables have to be the same.

Because Brand B was watered daily and Brand A was watered every other day, there is no way of knowing if the results were conclusive because of the heat lamps or the different watering patterns.

Hope this helps:)

it isnt valid

Step-by-step explanation:

she needs to keep the watering consistent for both areas to keep the constants the same

468

step-by-step explanation:

step-by-step explanation: so we look at the formula un = a + (n-1)d

un is the amount of seats

n is the nth term aka row number

a is the original sequence/row number

d is the difference between each term

so in this a=22 d=6 and n can remain as n because we are simply formjng a rule

lets put these in the equation

un=22+(n-1)(6)

this is your answer to part a

however

lets double check that this is correct, we'll try putting it into the second term

un=a+(n-1)d

u2=22+(2-1)(6)

u2=22+6

u2=28

as the question said the second row has 28 seats so now we know the formula we made is correct.

as for part b

un=a+(n-1)

its asking us to find a row with 100 seats.

remember un was the amount of seata so all we do is substitute this in.

un=100 a=22 d=6

un=a+(n-1)d

100=22+(n-1)(6)

so now we simplify to find n which is the row number.

100-22=22+(n-1)(6)-22

78=(n-1)(6)

78/6=(n-1)(6)/6

13=n-1

13+1=n-1+1

14=n

so now we know that in the 14th row there is 100 seats.

hope this and that you understood! its my first time using the app or anyone out on here : p its also me to revise so a bunch! ask more questions if you dont understand ☺