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3 years ago

15

Please help! Twenty points.

2 answers:

aleksandrvk [35]3 years ago

5 0

C but i need 20 characters so......

rjkz [21]3 years ago

3 0

Spefify your help please

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-43 - 4r = 3(1 - 9r)

kap26 [50]

Answer

r = 2

Step-by-step explanation:

6 0

3 years ago

If f(x) = 3 x-2 what is f(5.9)

Korvikt [17]

$3(5.9) = 17.7 \: \: \: \: 17.7 - 2 = 15.7$

3 0

3 years ago

Read 2 more answers

10. An arithmetic sequence has this recursive formula. What is the explicit formula?

Mrrafil [7]

Answer:

$a_{n}=45-3n$

Step-by-step explanation:

Method 1:

Arithmetic sequence is in the form

$a_{n} =a_{1} +(n-1)d\\$

d is the common difference, can be found by:

$d=a_{n}-a_{n-1}=-3$

Subtituting the $a_{1}$ and $d$

You get:

$a_{n}=42+(-3)(n-1)=45-3n$

Method 2 (Mathematical induction):

Assume it is in form $a_{n}=45-3n$

Base step: $a_{1} =45-3(1)=42$

Inducive hypophesis: $a_{n}=45-3n$

GIven: $a_{n+1} =a_{n}-3$

$a_{n+1}=45-3n-3=45-3(n+1)$

Proved by mathematical induction

$a_{n}=45-3n$

5 0

3 years ago

Five years ago Janeta age was one_fifth of her mother'sage .Now she is one_third of her mother's age.Find their present ages?

PilotLPTM [1.2K]

Answer:

J - Janeta's age M - mother's age

A) (J-5) = .2 * (M-5)

B) J = (1/3) * M

Subtracting 5 from both sides of B:

B) J -5 = (1/3)M -5

then we substitute the right side of this into the left side of A and we get

(1/3)M -5 = .2 M -1

.333333333333M -5 = .2M -1

.1111111111111111111M = 4

Mother's Age = 36

Janeta's Age = 12

Step-by-step explanation:

5 0

3 years ago

Solution for -2 1/3 divided by 4 2/3

Zina [86]

The answer would be -0.5 hope this helped!

4 0

2 years ago

Read 2 more answers