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3 years ago

Heeeellllllllllllllp!!!

Mathematics

1 answer:

tester [92]3 years ago

4 0

1⅓πr³ = 36π
r³ = 36π/1⅓π
r³ = 27
r = ³√27
r = 3 feet

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pls help will give brainliest Rena used the steps below to evaluate the expression (StartFraction (x Superscript negative 3 Base

kaheart [24]

Answer:

First "order of operations" mistake: step 2

First arithmetic mistake: step 4

Step-by-step explanation:

As we understand Rena's work, she wants to simplify ...

$\left(\dfrac{x^{-3}y^{-2}}{2x^4y^{-4}}\right)^{-3}$

for x = -1 and y = 2.

Her work seems to be ...

Step 1

$\text{Substitute $x=-1$ and $y=2$ into the expression}\\\\\left(\dfrac{(-1)^{-3}2^{-2}}{2(-1)^42^{-4}}\right)^{-3}\qquad\text{no error}$

Step 2

$\text{Simplify the parentheses}\\\\\left(\dfrac{2^4}{2(-1)^4(-1)^32^2}\right)^{-3}=\left(\dfrac{2^2}{2(-1)^7}\right)^{-3}\qquad\text{order of operations error}$

Step 3

$\text{Evaluate the power to a power}\\\\\dfrac{2^{-6}}{2^{-3}(-1)^{21}}\qquad\text{no error}$

Step 4

$\text{Use reciprocals and find the value}\\\\\dfrac{1}{2^32^6(-1)^{21}}=\dfrac{1}{8\cdot 64\cdot (-1)}=\dfrac{-1}{512}\qquad\text{error: $2^3$ is used instead of $2^{-3}$}$

_____

So, the first arithmetic error is in Step 4. However, the order of operations requires exponents be evaluated first. Doing that makes step 2 look like ...

$\left(\dfrac{-\dfrac{1}{4}}{2(1)\dfrac{1}{16}}\right)^{-3}=(-2)^{-3}\qquad\text{proper Step 2}$

We expect your answer is supposed to be Step 4.

7 0

4 years ago

the table shows the value of a savings bond that doubles in value after 5 years. Which statement describes the bond

beks73 [17]

I think its the first option maybe im not sure

8 0

3 years ago

A number n minus 3 is at least –5.

melisa1 [442]

Answer:

n-3≥-5

If you need the equation solved...

n-3≥-5

+3 +3

n≥-2

Hope this helped!! Have a great day c:

5 0

4 years ago

Izzy had an 82 and an 88 on his first two tests and believed that he did well enough on his final exam to keep his B average. H

Anastaziya [24]

Answer:

Step-by-step explanation:

to find the mean you need to add up all grades and divide if by the number of terms you added

(82 + 88 + x) ÷ 3 = 69 (since we don't know the third grade let's call it x)

170 + x = 69 × 3

x = 37

if the digits transposed the the actual grade would be 73

5 0

4 years ago

The cost of renting tuxes for the Choral Society's formal is $24 down, plus $89 per tux. Express the cost C as a function of x,

Phantasy [73]

A) The formula would be C = 89x + 24.

b) To find the cost of 2 tuxes, just plug in 2 for x and you get 202.

c) For the 4098th tux, plug in 4098 for x and you get $364,746.

d) The variable cost is the number of tuxes.
The fixed cost is the $24 down. The marginal cost is $89, the amount that it changes for each tux.

4 0

4 years ago

Read 2 more answers