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Ipatiy [6.2K]
3 years ago
12

Find the unknown value in the proportion: 7⁄15 = x⁄75

Mathematics
2 answers:
Zina [86]3 years ago
6 0

\frac{7}{15} = \frac{x}{75}      Multiply 75 to both sides of the equation

(75)\frac{7}{15} =\frac{x}{75} (75)

\frac{525}{15} =x

35 = x

riadik2000 [5.3K]3 years ago
3 0

We just need to multiply in a x format.


7/15 = x/75


Multiply 7 with 75 and 15 with x.


7 . 75 = 15 . x

525/15 = x

x = 35

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Which calculation should be used to calculate s9 for the arithmetic sequence an=3n-1
Ganezh [65]

Answer: Choice A

S9 = (9/2)*(2+26)

===============================================

The formula is

Sn = (n/2)*(a1+an)

where

Sn = sum of the first n terms (nth partial sum)

n = number of terms

a1 = first term

an = nth term

In this case,

n = 9

a1 = 2 (plug in n = 1 into the formula an = 3n-1 and simplify)

an = a9 = 26 (plug n = 9 into the formula an = 3n-1 and simplify)

So,

Sn = (n/2)*(a1+an)

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7 0
3 years ago
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Can someone plz help me with Algebra 2....... :) Will give Brainliest!!
Anarel [89]
Using logarithms property of log(x)+log(y)=log(xy)
so here, you can sum the equation to;
log((x+6)*(x-6))=2
so you can simply say that;
log_{8}((x+6)( x-6))=2
and by multiplying (x+6)*(x-6)
log_{8}(x^2-36)=2
and as you know also that;
a^{b}=c is same as log _{a}c=b
so you can simply state it as;
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64=x^2-36
64+36=x^2
x^2=100
x=10
And you can check your work by substituting with 10 instead of x in the original function.
Hope this helps!
6 0
3 years ago
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