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Vitek1552 [10]
3 years ago
7

I have no clue how to do this

Mathematics
1 answer:
jenyasd209 [6]3 years ago
7 0

(7x-9) + (2x) = 90

9x-9 =90

9x=99

x = 99/9

x =11

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Answer the one you would like!
Ksju [112]

first pic no 13

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3 0
3 years ago
<img src="https://tex.z-dn.net/?f=x%5Ea%3Dy%5Eb%3Dz%5Ec%20%5C%5Cxyz%3D1%5C%5Cab%2Bbc%2Bca%3D%3F" id="TexFormula1" title="x^a=y^b
SashulF [63]

Answer:

<em>ab+bc+ca=0</em>

Step-by-step explanation:

We are given:

x^a=y^b=z^c

xyz=1

Separating equations:

x^a=z^c

y^b=z^c

Solving the first equation for x:

\displaystyle x=z^\frac{c}{a}

Solving the second equation for y:

\displaystyle y=z^\frac{c}{b}

Substituting in

xyz=1:

\displaystyle z^\frac{c}{a}z^\frac{c}{b}z=1

Adding the exponents:

\displaystyle z^{\frac{c}{a}+\frac{c}{b}+1}=1

Since 1=z^0:

\displaystyle z^{\frac{c}{a}+\frac{c}{b}+1}=z^0

The base is z on both sides so we get rid of them:

\displaystyle \frac{c}{a}+\frac{c}{b}+1=0

Multiplying by ab:

bc+ac+ab=0

Reordering:

ab+bc+ca=0

5 0
3 years ago
Find the sum of the geometric series 1−0.99+0.99^2−0.99 ^3 +...−0.99
pickupchik [31]

Answer:

-0.970199

Step-by-step explanation:

5 0
4 years ago
Read 2 more answers
What is the answer 6•4+2/2-7
Nitella [24]

Answer:

18 is the answer

Step-by-step explanation: Solve by multiplication/division first and then addition and/subtraction

5 0
3 years ago
Mark estimated that the drive would take 3,000 minutes. It ended up taking 2 days. Did the drive take longer or shorter than he
Arlecino [84]

Answer:

The driver took shorter than estimated

It took shorter by 2 hours( 120

minutes)

Step-by-step explanation:

Firstly we want to know if the drive took longer or shorter

By 2 days, the number of hours will be 2 * 24 = 48 hours ( recall 24 hours = 1 day

now , since 60 minutes give one hour, then 48 hours will me 60 * 48 = 2,880 hours

This is less than 3,000 hours

By how much?

Simply subtract the value of minutes in 48 hours from 3,000 = 3000-2880 = 120 minutes ( or two hours)

5 0
3 years ago
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