1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
andrew-mc [135]
3 years ago
11

Parker is testing 2 different types of ant killer in his yard. He purchases Brand A and Brand B from the home improvement store.

He applies Brand A in the front yard on Monday and Brand B in the backyard on Saturday. He then compares the ant hills on Sunday and determines that Brand A is more effective than Brand B. Why is his conclusion not valid? He purchased 2 different types of ant killer.
He did not say how many ant hills he had at the beginning of the test.
He did not wait as long between each treatment of ant killer.
He applied 1 treatment to the front yard and 1 treatment to the backyard.
Mathematics
1 answer:
NNADVOKAT [17]3 years ago
8 0

Answer:

 

He did not wait as long between each treatment of ant killer.

Step-by-step explanation:

He did one on monday and another on saturday then checked them on sunday

You might be interested in
Which of the following is the correct notation for the complex number √-64-12
Liono4ka [1.6K]
The answer would be -12+8i
6 0
3 years ago
For each vector field f⃗ (x,y,z), compute the curl of f⃗ and, if possible, find a function f(x,y,z) so that f⃗ =∇f. if no such f
butalik [34]

\vec f(x,y,z)=(2yze^{2xyz}+4z^2\cos(xz^2))\,\vec\imath+2xze^{2xyz}\,\vec\jmath+(2xye^{2xyz}+8xz\cos(xz^2))\,\vec k

Let

\vec f=f_1\,\vec\imath+f_2\,\vec\jmath+f_3\,\vec k

The curl is

\nabla\cdot\vec f=(\partial_x\,\vec\imath+\partial_y\,\vec\jmath+\partial_z\,\vec k)\times(f_1\,\vec\imath+f_2\,\vec\jmath+f_3\,\vec k)

where \partial_\xi denotes the partial derivative operator with respect to \xi. Recall that

\vec\imath\times\vec\jmath=\vec k

\vec\jmath\times\vec k=\vec i

\vec k\times\vec\imath=\vec\jmath

and that for any two vectors \vec a and \vec b, \vec a\times\vec b=-\vec b\times\vec a, and \vec a\times\vec a=\vec0.

The cross product reduces to

\nabla\times\vec f=(\partial_yf_3-\partial_zf_2)\,\vec\imath+(\partial_xf_3-\partial_zf_1)\,\vec\jmath+(\partial_xf_2-\partial_yf_1)\,\vec k

When you compute the partial derivatives, you'll find that all the components reduce to 0 and

\nabla\times\vec f=\vec0

which means \vec f is indeed conservative and we can find f.

Integrate both sides of

\dfrac{\partial f}{\partial y}=2xze^{2xyz}

with respect to y and

\implies f(x,y,z)=e^{2xyz}+g(x,z)

Differentiate both sides with respect to x and

\dfrac{\partial f}{\partial x}=\dfrac{\partial(e^{2xyz})}{\partial x}+\dfrac{\partial g}{\partial x}

2yze^{2xyz}+4z^2\cos(xz^2)=2yze^{2xyz}+\dfrac{\partial g}{\partial x}

4z^2\cos(xz^2)=\dfrac{\partial g}{\partial x}

\implies g(x,z)=4\sin(xz^2)+h(z)

Now

f(x,y,z)=e^{2xyz}+4\sin(xz^2)+h(z)

and differentiating with respect to z gives

\dfrac{\partial f}{\partial z}=\dfrac{\partial(e^{2xyz}+4\sin(xz^2))}{\partial z}+\dfrac{\mathrm dh}{\mathrm dz}

2xye^{2xyz}+8xz\cos(xz^2)=2xye^{2xyz}+8xz\cos(xz^2)+\dfrac{\mathrm dh}{\mathrm dz}

\dfrac{\mathrm dh}{\mathrm dz}=0

\implies h(z)=C

for some constant C. So

f(x,y,z)=e^{2xyz}+4\sin(xz^2)+C

3 0
3 years ago
ILL Give you brainlist if you answer it’s really URGENT PLS
forsale [732]

Answer:

A (3/2, 9/2)

Step-by-step explanation:

Let's take the first solution which is (3/2 , 9/2). If we substitute 3/2 into x we get the equation (3/2)^2 we get y as 9/4 not 9/2, therefore (3/2 , 9/2) does not lie on the curve y = x^2

6 0
3 years ago
Read 2 more answers
Can someone help me out in these 3 questions??
alisha [4.7K]

Answer:

I'm not completely sure about the first one, but #8 is 0.0419, and #9 is 30500.

5 0
3 years ago
PLEASE HELP ME!!!!!!!!!
Contact [7]

Answer:

Step-by-step explanation:

you could subtract and divid

7 0
3 years ago
Other questions:
  • The 50th term of a sequence is 102 with a difference of 2. Find the first term.
    10·1 answer
  • Rachels neighborhood kids pool is shaped like a square with an area of 120 what is the appropriate side length of the pool?
    5·2 answers
  • Write an inequality for the sentence. <br><br> c is not less than zero.
    8·1 answer
  • What’s the slope for this graphed?<br> A.1/2<br> B.-2<br> C.2<br> D.-3
    7·1 answer
  • A small publishing company is planning to publish a new book. The production costs will include one-time fixed costs (such as ed
    9·1 answer
  • Which is the solution to the equation -3x-4=5(x+4)
    7·2 answers
  • Need help not good with geometry
    13·2 answers
  • Luca has 13 more crayons than Sam. If Luca has 42 crayons, how many crayons does Sam have ?
    15·1 answer
  • The price of an ice cream cone is $2.75. You buy one for yourself and another for your little brother. How much sales tax will y
    12·1 answer
  • Simplify radicals please
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!