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2 years ago

If a/4 = b/7, what is the value of (a-b) / b?

Mathematics

2 answers:

DerKrebs [107]2 years ago

8 0

First we will find out the values of a
a/4=b/7
a=4b/7

Now
(a-b)/b
{4b/7-b}/b
(4b-7b)/7b
-3b/7b
-3/7

borishaifa [10]2 years ago

8 0

Answer:

-3/7

Step-by-step explanation:

a/4=b/7

a/b=4/7

(a-b)/b=(3-7)/7

(a-b)/b=-3/7

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3 years ago

Two cubes have their surface areas in the ratio 1:4 , what is the ratio of their volumes ?

yKpoI14uk [10]

Answer:

1 : 8

Step-by-step explanation:

For similar figures with ratio of sides = a : b

Then ratio of areas = a² : b² and

ratio of volumes = a³ : b³

Given ratio of areas = 1 : 4

linear ratio = $\sqrt{1}$ : $\sqrt{4}$ = 1 : 2

ratio of volumes = 1³ : 2³ = 1 : 8

8 0

3 years ago

Am I right about this or..?

Arisa [49]

Answer:

Correct, as 4 is the only number repeating twice

4 0

3 years ago

I =125 r=6% t=1 what is p

vfiekz [6]

There is no P in here, you can't solve for P without a P, Or I just don't get the question.

4 0

3 years ago

Round to the nearest hundredth (Geometric Series problem)

WITCHER [35]

Answer:

15.98

Step-by-step explanation:

∑₁¹⁰ $8(\frac{1}{4} )^{n-1}$

$=8[1+\frac{1}{4} +\frac{1}{16} + ........ +t_{10}]$

We have to use the formula of sum of a G.P. series with common ratio r < 1.

If the first term is a, the common ratio is r and the number of terms is n then the sum [a + ar + ar² + ar³ + ......... up to n terms] is given by

$[a \times\frac{1-r^{n} }{1-r}]$

$= 8[1 \times \frac{1-\frac{1}{2^{10} } }{1-\frac{1}{2} } ]$

$= 15.98$ (Answer)

4 0

2 years ago