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3 years ago

a biologist wants to determine the effect of a new fertilizer on tomato plants. what would be the control

2 answers:

6 0

The control could be sunlight, water, temperature, or the type of soil, but i would have to go with a main one, the type of plant, tomato plant. hope i helped.

leonid [27]3 years ago

3 0

First, the biologist must define the variables:

Dependent- this is what will be measured. So the biologist may want to measure the weight and height of the tomatoes, or the leaf area or the time it will produce the fruit.

Independent- this is what will differ in the experiment and what the biologist thinks will affect the dependent variable. In this case, the biologist will use new fertilizer on plant A, old fertilizer on plant B, and no fertilizer on plant C.
Controlled- these variables must be held constant because the biologist doesn’t want other factors to affect the growth of the tomato plant, thus, destroying the purpose of the experiment, tomato plant A, B, and C will have equal amounts of soil, water, and carbon dioxide, and exposure to sunlight.

After his experimentation, he will conclude which of the plant has better weight, growth, leaf, and fruit. If Plant A is the best tomato plant of them all, then he can say that the new fertilizer is more effective.

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A town has a population of 3373 people at time t equals 0. the population increases by 6 % per year. write a formula for the pop

salantis [7]

P0 = 1000

(A) pt = 1000 + 90t ; 1000 + 90 + 90 + 90 ... 
(B) pt = 1000 * 1.03^t ; ((10000 * 1.03) * 1.03)..

6 0

3 years ago

Two vectors A⃗ and B⃗ have magnitude A = 2.93 and B = 3.00. Their vector product is A⃗ ×B⃗ = -4.95k^ + 1.94 i^. What is the angl

Klio2033 [76]

Answer:

Angle is 37.21 degree

Step-by-step explanation:

Given Data

|A|=2.93

|B|=3.00

A×B=-4.95k+1.94i

Angle=?

Solution

|A×B|=|A|×|B|Sinα

First for |A×B|

|A×B|= $\sqrt{x^{2}+y^{2} }$

|A×B|= $\sqrt{(-4.95)^{2}+(1.94)^{2} }$

|A×B|=5.316

|A×B|=|A|×|B|Sinα

Sinα= $\frac{|A*B|}{|A||B|}$

Sinα= $\frac{5.316}{8.79}$

α=37.21 degree

4 0

3 years ago

This is an isosceles trapezoid. R. s 75 X Y У T U

LekaFEV [45]

Answer:

S=R

75+75=150

360-150=210

210/2=105

y=105

5 0

3 years ago

Read 2 more answers

In a game show, contestants gain or lose points by answering questions. Jacob began with 27 points, then he lost 53 points and g

tatuchka [14]

Answer:

His final score was -11 points

Step-by-step explanation:

27 - 53 = -26

-26 + 15 = -11

4 0

3 years ago

Find side lengths C and H

Nuetrik [128]

Answer:

$\displaystyle c=\frac{2\sqrt{3}}{3}\\\\\displaystyle h=7\sqrt{2}\\$

Step-by-step explanation:

Right Triangles

A right triangle can be identified by the fact it has an internal angle of 90°. In a right triangle, the trigonometric ratios stand.

Let's consider the triangle to the left. We need to calculate side c, one of the legs of the triangle. We can use the angle adjacent to it (60°) or the angle opposite to it (30°) with the appropriate trigonometric ratio.

We'll use the adjacent angle, and

$\displaystyle tan60^o=\frac{2}{c}$

Solving for c

$\displaystyle c=\frac{2}{tan60^o}=\frac{2}{\sqrt{3}}$

Rationalizing

$\displaystyle c=\frac{2}{\sqrt{3}}\cdot \frac{\sqrt{3}}{\sqrt{3}}=\frac{2\sqrt{3}}{3}$

Now for the triangle to the right. The side h is the hypotenuse. Again, any of the two angles can be used (though they are equal, for it's an isosceles triangle). For any of them it is true that

$\displaystyle sin45^o=\frac{7}{h}$

Solving for h

$\displaystyle h=\frac{7}{sin45^o}=\frac{7}{\frac{\sqrt{2}}{2}}=\frac{14}{\sqrt{2}}$

Rationalizing

$\displaystyle h=\frac{14}{\sqrt{2}}\cdot \frac{\sqrt{2}}{\sqrt{2}}=\frac{14\sqrt{2}}{2}=7\sqrt{2}$

3 0

4 years ago