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2 years ago

Help pleeeeeeeeeease

Mathematics

1 answer:

TEA [102]2 years ago

5 0

Answer:

452.16

Step-by-step explanation:

the equation is A=nr^2

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How do you find x???

sergij07 [2.7K]

The first thing you want to do is isolate the (x)s.

6 0

3 years ago

Read 2 more answers

Verify 3/4 + (7/2 + -3/8) = 3/4 + 7/2 + (-3/8)

Mrac [35]

Answer:

true

Step-by-step explanation:

Since the parenthesis do not have a negative on the outside, we don't need to distribute the negative sign. The equation is equal to each other

Hope that helps :)

6 0

3 years ago

What is the smallest number that appears in both rows this number is said to be the least common multiples of 2 and 3

Mandarinka [93]

The least common multiples of 2 and 3 would be 2 and 1 also 2 and is at its lowest multiple

4 0

3 years ago

A thermometer is taken from an inside room to the outside, where the air temperature is 20° f. after 1 minute the thermometer re

fomenos

The change in the temperature is proportional to the difference in temperatures. Let's call the initial temperature of the room and the thermometer $E_0$ and the current temperature $E(t)$ where $t$ is the elapsed time in minutes. The outside temperature is 20 F.

Newton's Law of Cooling:

$E(t) - 20 = (E_0 - 20) e^{- k t}$

We're given $E(1)=70 \textrm{ and } E(5)=45$

$70-20 = (E_0 - 20) e^{-k}$

$45-20 =(E_0 - 20) e^{-5k}$

Dividing,

$\dfrac{50}{25}=e^{4k}$

$k = \dfrac 1 4 \ln 2$

Now,

$E(t) - 20 = (E_0 - 20) e^{- k t}$

$E_0 = 20 + (E(t) - 20)e^{k t}$

$E_0 = 20 + (E(1) - 20)e^{k}$

$E_0 = 20 + (70 - 20)e^{\ln 2/4}$

$E_0 = 20 + 50 \cdot 2^{1/4} \approx 79.46 \textrm{ degrees F}$

3 0

3 years ago

Express b+1/3b-2 with “b” as the subject

lara [203]

Answer:

b = $\frac{1+2a}{3a-1}$

Step-by-step explanation:

Given

a = $\frac{b+1}{3b-2}$ ( multiply both sides by 3b - 2 )

a(3b - 2) = b + 1 ← distribute left side

3ab - 2a = b + 1 ( subtract b from both sides )

3ab - b - 2a = 1 ( add 2a to both sides )

3ab - b = 1 + 2a ← factor out b from each term on the left side

b(3a - 1) = 1 + 2a ( divide both sides by 3a - 1 )

b = $\frac{1+2a}{3a-1}$

4 0

3 years ago