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mojhsa [17]
3 years ago
14

Do number 20 please i need help

Mathematics
2 answers:
Sedaia [141]3 years ago
8 0
The store's sales equate to $6000
Gelneren [198K]3 years ago
5 0
It's a $1.30 each note book
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David bought 3 dvds and 4 books for $40 at a yard sale. Anna bought 1 dvd and 6 books for $18. How much did each dvd and book co
Ber [7]

Answer:

A book is worth $1 and a DVD is worth $12.

Step-by-step explanation:

The equations (2 unknowns and two equations, d is for a DVD and b is for a book):

For David: 3d+4b=40

For Anna: d+6b=18

Now multiply the second equation with -3 and add to the first equation:

3d+4b=40

−3d−18b=−54

Combined equation: −14b=−14 and b=1 (means that each book is worth $1).

 

Now for DVD price, use the second equation:

d=18−6 or d=12 (means that each DVD  is worth $12).

A book is worth $1 and a DVD is worth $12.

8 0
3 years ago
Order of operations with integers<br><br> Please help solve with steps:<br><br> 3+4 x (-5)
lilavasa [31]

Answer:

-17

Step-by-step explanation:

3 + 4(-5)

= 3-20

= -17

Hope this helps!

5 0
3 years ago
Read 2 more answers
Find the distance between (2.3) and (0,6).
Ann [662]
Use the distance formula
And just plug in your numbers and solve

5 0
2 years ago
What is 1/2 + 3/4???
Papessa [141]
1/2 + 3/4 = 

1/2 = 2/4

2/4 + 3/4 = 5/4 = 1 1/4

Answer = 1 1/4

Hope this helped☺☺
8 0
3 years ago
Read 2 more answers
Gretchen has a set of blocks of heights 1, 2, and 4-centimeters. Imagine stacking the blocks one on top of the other to make a t
notsponge [240]

Answer:

t_{n}=t_{n-1}+t_{n-2} +t_{n-4}

Step-by-step explanation:

t_{n}=multiple ways to climb a tower

When n = 1,

tower= 1 cm  

t_{1}= 1

When n = 2,

tower =2 cm   

t_{2}= 2

When n = 3,

tower = 3 cm

it can be build if we use three 1 cm blocks

t_{3} = 3

When n = 4,

tower= 4 cm

it can be build if we use four 1 cm blocks

t_{4} = 6

When n > 5

tower height > 4 cm

so we can use 1 cm, 2 cm and 4 cm blocks

so in that case if our last move is 1 cm block then t_{n-1} will be

n —1 cm

if our last move is 2 cm block then t_{n-2} will be

n —2 cm

if our last move is 4 cm block then t_{n-4} will be

n —4 cm

 

t_{n}=t_{n-1}+t_{n-2} +t_{n-4}

4 0
3 years ago
Read 2 more answers
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