3 years ago

PLEASE HELP ASAP!!!!

Mathematics

1 answer:

Fynjy0 [20]3 years ago

6 0

Answer:

It is not valid since there is more than one variable being changed at one.

Step-by-step explanation:

Jackson changed the brand of soil, but he also changes the amount of water, and the amount of sunlight the plants are receiving, so his conclusion that the soil was more effective is not valid.

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LiRa [457]

Answer:

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Step-by-step explanation:

4 0

3 years ago

Solve the system of equations by substitution.<br> 2m - 7n = -18.5<br> m = 10 - 2n

Elan Coil [88]

You can just substitute the m in the first equation
like this ; 2(10 - 2n) - 7n = -18.5

4 0

3 years ago

Expand and simplify ( m + 7 )( m + 3 )

liubo4ka [24]

M^2+10m+21 is the answer

5 0

3 years ago

The heights of women aged 20 to 29 is approximately Normal with mean 64 inches and standard deviation 2.7 inches. What proportio

natima [27]

20. 64. 2.7
+29 +49 58.6
------ ------ ---------
49. 113 60 .3

49+60.3+113=21.5

4 0

3 years ago

Which values will only have one zero??

Digiron [165]

If it has a single zero that means it has to be just touching the x-axis with its tip.

We know that if it has only one zero, the discriminant equals 0.

So,

$D=b^2-4ac=0\implies (-k)^2-4(1)(9)=0$

Solving for k,

$k=\pm\sqrt{36}=\boxed{\pm{6}}$ .

Hope this helps.

3 0

4 years ago