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3 years ago

How to cheat using my math lab ?

Mathematics

2 answers:

Serhud [2]3 years ago

7 0

I can't say I know what a math lab is, but there's always a way to cheat on anything XD

mezya [45]3 years ago

3 0

You cant cheat in a meth lab lol

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In the expansion (ax+by)^7, the coefficients of the first two terms are 128 and -224, respectively. Find the values of a and b

madam [21]

Answer:

a = 2, b = 3.5

Step-by-step explanation:

Expanding $(ax+by)^7$ using Binomial expansion, we have that:

$(ax+by)^7$ =

$(ax)^7(by)^0 + (ax)^6(by)^1 + (ax)^5(by)^2 + (ax)^4(by)^3 + (ax)^3(by)^4 + (ax)^2(by)^5 + (ax)^1(by)^6 + (ax)^0(by)^7$

$= (a)^7(x)^7+ (a)^6(x)^6(b)(y) + (a)^5(x)^5(b)^2(y)^2 + (a)^4(x)^4(b)^3(y)^3 + (a)^3(x)^3(b)^4(y)^4 + (a)^2(x)^2(b)^5(y)^5 + (a)(x)(b)^6(y)^6 + (b)^7(y)^7\\\\\\= (a)^7(x)^7+ (a)^6(b)(x)^6(y) + (a)^5(b)^2(x)^5(y)^2 + (a)^4(b)^3(x)^4(y)^3 + (a)^3(b)^4(x)^3(y)^4 + (a)^2(b)^5(x)^2(y)^5 + (a)(b)^6(x)(y)^6 + (b)^7(y)^7$

We have that the coefficients of the first two terms are 128 and -224.

For the first term:

=> $a^7 = 128$

=> $a = \sqrt[7]{128}\\ \\\\a = 2$

For the second term:

$a^6b = -224$

$b = \frac{-224}{a^6}$

$b = \frac{-224}{2^6} \\\\\\b = \frac{-224}{64} \\\\\\b = 3.5$

Therefore, a = 2, b = 3.5

5 0

3 years ago

What is in scientific notation?

suter [353]

So for this, you will be dividing 9.3/3.1 and 10^34/10^17 separately.

Starting with 9.3/3.1, that equals 3

Now with 10^34/10^17, remember that the rule with dividing exponents with the same base is that you are just subtracting the exponents. In this case: 10^(34 - 17) = 10^17

Now we put the two quantities together, and your answer will be 3 x 10^17, or the second option.

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3 years ago

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Isidro wants to by a scooter for $89.75. The sales tax is found by multiplying the price of the scooter by 0.065. Find the total

statuscvo [17]

Answer:

Step-by-step explanation:

the scooter is 89.75

sales tax= 89.75*0.065=5.83

total cost=89.75+5.83=95.58

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3 years ago

What is 5 pi over 4 radians in degrees? <br> 45°<br> 135°<br> 225°<br> 315°

lidiya [134]

225 (since the fraction is over 180° (because 5Π/4 > Π we know that the answer must be bigger than 180° (because 180° = Π (radians)
and its less than 270° because 270° = 3Π/2 or 6π/4

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Jack goes to a store and selects 2

Sav [38]

For questions like this just multiply the prices by how many they're buying and add all the numbers up and subtract by how much they have to begin with.

Example:

$34.99×2=$69.98

$16.50×3=$49.50

$3.75×4=$15

$69.98+$49.50+$15=$134.48

$134.48-$125=$9.48

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3 years ago