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notka56 [123]
2 years ago
14

Ms. Chin asked her students to use the properties of multiplication to rewrite the expression (negative 5) (Negative StartFracti

on 2 over 7 EndFraction) Left-bracket (StartFraction 4 over 11 EndFraction) (negative 9) Right-bracket. The table below shows the properties that each of four students used to rewrite the expression.
Expressions Generated by Students
Student
Properties used to rewrite the expression
Mitul
Commutative property
Stacy
Associative property
Tom
Associative property and then the commutative property
Walt
Commutative property and then the associative property

How many of the students created an expression that was equivalent to the original?
one
two
three
four
Mathematics
2 answers:
12345 [234]2 years ago
4 0

Answer:

Three

Step-by-step explanation: :)

natali 33 [55]2 years ago
3 0

Answer:

three

Step-by-step explanation:

hope it hlps

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Find the area of the surface. the part of the hyperbolic paraboloid z = y2 − x2 that lies between the cylinders x2 + y2 = 4 and
Nadusha1986 [10]
Call the surface S; then the area of S is given by the surface integral

\displaystyle\iint_S\mathrm d\mathbf S

Parameterize the surface by

\mathbf r(u,v)=\begin{cases}x(u,v)=u\cos v\\y(u,v)=u\sin v\\z(u,v)=u^2\cos^2v-u^2\sin^2v=u^2\cos2v\end{cases}

with 2\le u\le4 and 0\le v\le2\pi. The surface element is given by

\mathrm d\mathbf S=\|\mathbf r_u\times\mathbf r_v\|\,\mathrm du\,\mathrm dv
\mathrm d\mathbf S=u\sqrt{1+4u^2}\,\mathrm du\,\mathrm dv

So the area is

\displaystyle\iint_S\mathrm d\mathbf S=\int_{v=0}^{v=2\pi}\int_{u=2}^{u=4}u\sqrt{1+4u^2}\,\mathrm du\,\mathrm dv
=\displaystyle2\pi\int_{w=17}^{w=65}\sqrt w\,\frac{\mathrm dw}8

where w=1+4u^2\implies\mathrm dw=8u\,\mathrm du

=\displaystyle\frac\pi4\frac23w^{3/2}\bigg|_{w=17}^{w=65}
=\dfrac\pi6\left(65^{3/2}-17^{3/2}\right)\approx237.69
8 0
3 years ago
The point ( -3, -5 ) is on the graph of a function. which equation must be true regarding the function?
Y_Kistochka [10]

Answer:-4-5

Step-by-step explanation:

7 0
3 years ago
Divide: 7/8 ÷ 3/8<br><br> A) 21/64<br><br> B) 3/7<br><br> C) 64/21<br><br> D) 7/3
lozanna [386]

Answer:

When you need to divide two fractions, reverse the second fraction, then multiply the top numbers by each other and the bottom numbers by each other.


7/8 / 3/8 =

7/8 x 8/3 =

(7 x 8) / (8 x 3) =

56/24 which reduces to 7/3

The answer is D) 7/3


5 0
3 years ago
timothy is planting a garden. Tulips cost $125 per bub. The total cost c of his gardening supplies is $1.25 per bub b plus $10 f
N76 [4]

Answer:

Independent variable = number of bub (b)

Dependent variable = total cost (c)

Equation: c = $1.25b + $10

Timothy would spend: $20

Step-by-step explanation:

Total cost = c

Number of bub = b

✔️Total cost, c, is dependent on the number of bub, b.

Therefore:

Independent variable = number of bub (b)

Dependent variable = total cost (c)

✔️Equation that describes this situation can be written as:

c = $1.25b + $10

✔️If Timorhy buys 8 bubs, he would spend the following:

Substitute b = 8 into c = $1.25b + $10, and solve for c.

c = $1.25(8) + $10

c = $10 + $10

c = $20

4 0
2 years ago
Solve y=2x-1 2x-y-1=0​
noname [10]

Answer:

Replace all occurrences of y with 2x−1 in each equation.

0=0

y=2x−1

Remove any equations from the system that are always true.

y=2x−1

Step-by-step explanation:

3 0
2 years ago
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