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IrinaK [193]
3 years ago
15

I need a full explanation on -(i^2) I know it equals 1, but how?

Mathematics
1 answer:
Oksanka [162]3 years ago
7 0
I^2 is negative 1, but I see you have a negative sign there. So it is -(-1), which is 1.
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Emma borrowed $89.40 from her sister. She determines that she can pay her back the total over six months. Which number reflects
omeli [17]

Answer:

$14.9

Step-by-step explanation:

Step one:

given data

we are told that Emma borrowed $89.40 from her sister to pay her back in 6 months.

let us solve for the amount she is to pay her sister every month.

amount to be paid per month= 89.40/6

=$14.9

So that every month she pays back her sister $14.9

we don't know her balance but every month there will be a deduction.

Hence the monthly change in her balance is reflected by a deduction of $14.9

5 0
3 years ago
If 800g of a radioactive substance are present initially and 8 years later only 450g remain, how much of the substance will be p
artcher [175]

A=Pe^(rt)

P = 800g

t = 8 years

A = 450g

r = This is what we will try and find to start with

450=800e^(r*8)

After running the math through a calculator, we end with r = -0.07192

Now we just re-input this information into our equation: A=800e^(-0.07192*16)

A=800e^(1.15072)

Now we will re-write the equation using the negative exponent rule:

A = 800 1/e^1.15072

Combine right side:

A = 800/e^1.15072

Then do the math:

A = 253.12709836......

That will give us A = 253 (rounded to the whole number)

I hope this helps! :)

5 0
3 years ago
What is a solution to f(x)=0
Brilliant_brown [7]

Answer:

F=0

Step-by-step explanation:

3 0
3 years ago
Kyle drove his car 250 miles on 20 gallons of gas. How many miles per gallon did Kyle average?
weqwewe [10]

Answer:

Step-by-step explanation:

250 divided by 20= 12.5

So 12.5 miles per gallon.

6 0
3 years ago
Read 2 more answers
PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! SUPER IMPORTANT QUESTION!!!
Anettt [7]

Answer:

Distance between two cities is 193.94 miles.

Step-by-step explanation:

We have,

Madison and Wisconsin have latitudes 43.0731°N and 45.9172°N respectively.

Thus, their difference is 45.9172°N - 43.0731°N = 2.8441°

We assumed, the diameter of earth is 7917.5 miles.

So, the radius = \frac{7917.5}{2} = 3958.75 miles

So, using the cosine formula, we have,

a^{2}=b^{2}+c^{2}-2bc\cos A

i.e. a^{2}=3958.75^{2}+3958.75^{2}-2\times 3958.75\times \cos 2.8441

i.e. a^{2}=31343403.13\times 0.0012

i.e. a^{2}=37612.08

i.e. a= 193.94 miles.

Hence, the distance between two cities is 193.94 miles.

8 0
2 years ago
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