# math plz help

posted by .

Use the table to complete each part.

a. Copy the table. Extend the table by writing expressions for y when x = 5, 6, and 7.

b. Simplify each expression for y in the table from part (a). What pattern do you notice in the simplified expressions?

c. Write an equation that relates x and y. Us your equation to find the value of y when x = 15.

The Table:

x | y
1 | 1
2 | 1 + 2
3 | 1 + 2 +4
4 | 1 + 2 + 4 + 8

• math plz help -

plz help!

• math plz help -

let's get the actual answers for the y values

x | y
1 | 1 = 1
2 | 1 + 2 = 3
3 | 1 + 2 +4 = 7
4 | 1 + 2 + 4 + 8 = 15

5 | 1+2+4+8+16 = 32
6 | 1+2+4+8+16+32 = 63

Did you notice that all the sums are one less than a power of 2

e.g for x = 3, the sum = 7 = 2^3 - 1
for x = 6 , the sum = 63 = 2^6 - 1

so when x = 15, the sum should be 2^15 - 1 = 32767

• math plz help -

Okay thanks can you help with this one?

Solve. Show all your work and explain your steps.

You are buying gifts for 10 people. You decide to buy each person either a CD or a DVD. A CD costs \$12 and a DVD cost \$20.

a. Let c = the number of CDs you decide to buy. What is an expression in terms of c for the number of DVDs you buy?

b. What is an expression in terms of c for the cost of the CDs? For the cost of the DVDs?

c. Write and simplify an expression in terms of c for the total cost of all the gifts you buy.

• math plz help -

Let c = the number of CDs you decide to buy
Then the number of DVDs is 10 - c

cost of CD = 12c
cost of DVD = 20(10-c)

total cost = 12c + 20(10-c)
= 12c + 200 - 20c
= 200 - 8c

• math plz help -

thank you ssssoooooo much !

• math plz help -

The property used is Distributive correct? Would we say it has commutative property of addition as well or just Distributive?
thanks

## Similar Questions

1. ### Periodic Table

Does anyone know where I can find a really good copy of the periodic table?
2. ### Algebra 2

I have a homework problem dealing with Inverse Variation which I don't get at all. 1. Copy and complete each table using the given equation. a.|x | y | b. |x |y | |0.2| | |1/4| | | |3.2 | |1/2| | | | 1 | | | 1 | |4 | | | | 2 | |2 | …
3. ### math

Copy each equation in Exercises 31–33. Replace the boldface italic letter with a number that shows the relationship indicated in the table. Then copy each table and complete it by using the corresponding equation.
4. ### Math 157

Copy each equation in Exercises 31–33. Replace the boldface italic letter with a number that shows the relationship indicated in the table. Then copy each table and complete it by using the corresponding equation. 32. y = -x + b …
5. ### math

Copy each equation in Exercises 31–33. Replace the boldface italic letter with a number that shows the relationship indicated in the table. Then copy each table and complete it by using the corresponding equation. 32. y= -x+b x y …
6. ### Math

Use the following table to answer questions. x y 1 7 3 ?
7. ### Math

Given table, X (1+x)^(1/x) -0.5. 4 -0.1 2.8680 -0.01 2.7320 -0.001 2.7196 0.001 2.7169 0.01 2.7048 0.1 2.5937 0 5 2.25 From the table, show that lim x->infinity (1+x)^(1/x)=e. Plz someone show me the step how to show it based on …
8. ### Math

Given table, X ; (1+x)^(1/x) -0.5. ; 4 -0.1 ; 2.8680 -0.01 ; 2.7320 -0.001; 2.7196 0.001 ; 2.7169 0.01 ; 2.7048 0.1 ; 2.5937 0 5 ; 2.25 From the table, show that lim x->infinity (1+x)^(1/x)=e. Plz someone show me the step how to …
9. ### Writing - APA

For writing in APA and your table goes on two pages, do you just repeat the table header rows?
10. ### English

1. She looked at the person on the table.(When the person is on the table, 'on the table' is an adjective phrase.) 2. She looked at the person on the table.(When she is on the table, 'on the table' is an adverbial phrase.) (How can …

More Similar Questions