All categories

3 years ago

What is the value of -9 r - 7 when r = 2?

Mathematics

1 answer:

sashaice [31]3 years ago

3 0

Answer:

I thinks its r = 11

Step-by-step explanation:

So you just need to take the number to the r and multipliy it by r So,

9x2=18

then minus it by the other number which would Be 7 so.

18-7=11

You might be interested in

Leo's bank balances at the end of months 1, 2, and 3 are $1500, $1530, and $1560.60,

grandymaker [24]

Leo's balance after 9 months will be: $1757.49

Step-by-step explanation:

It is given that the balances follow a geometric sequence

First of all, we have to find the common ratio

Here

$a_1 = 1500\\a_2 = 1530\\a_3 = 1560.60$

Common ratio is:

$r = \frac{a_2}{a_1} = \frac{1530}{1500} = 1.02\\r = \frac{a_3}{a_2} = \frac{1560.60}{1530} = 1.02$

So r = 1.02

The general form for geometric sequence is:

$a_n = a_1r^{n-1}$

Putting the first term and r

$a_n = 1500 . (1.02)^{n-1}$

To find the 9th month's balance

Putting n=9

$a_9 = 1500 . (1.02)^{9-1}\\= 1500.(1.02)^8\\=1757.4890$

Rounding off to nearest hundredth

$1757.49

Hence,

Leo's balance after 9 months will be: $1757.49

Keywords: Geometric sequence, balance

Learn more about geometric sequence at:

#LearnwithBrainly

5 0

2 years ago

I need help please help me pu

Luba_88 [7]

Answer:

D: x=12

Step-by-step explanation:

7 0

2 years ago

inessss [21]

Answer:

Step-by-step explanation:

Using the similarity theorem;

AB/BC = AD/AB

x/7+3 = 7/x

x/10 = 7/x

x^2 = 70

x = √70

Hence the required value inside square root is 70

6 0

3 years ago

Find the x intercept. (Using the equation is more accurate, but I included a graph for reference)

MariettaO [177]

For the X intercept you set y = 0 and solve for x

Y = $- \frac{8}{3}$ x + 9
0= $- \frac{8}{3}$ x + 9 subtract 9 from both sides
-9 = $-\frac{8}{3} x$ divide both sides by 3
-3 = -8x divide both sides by -8
$\frac{3}{8}$ = x

X-intercept = ( $\frac{3}{8}$ , 0)

4 0

2 years ago

What shapes have 2 pairs of parallel sides? Choose all that arw correct.

liubo4ka [24]

Answer:

can we see the options please

8 0

2 years ago

Read 2 more answers