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Zigmanuir [339]
3 years ago
8

David bought three DVDs and four books for $40 at a yard sale. Anna bought one DVD and six books for $18. how much did each DVD

and book cost ?
Mathematics
1 answer:
Dvinal [7]3 years ago
5 0

Answer: Anna bought 1 DVD and 6 books for $18. How much did each DVD and book cost? ... Your equations (2 unknowns and two equations, d is for a DVD and b is ... For Anna: d+6b=18 ... Combined equation: −14b=−14 and b=1 (means that each book worths $1). Now for DVD price,

Step-by-step explanation:

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7g + 11 subtracted from 12
BlackZzzverrR [31]
A subtracted from b means b-a

7g+11 subtracted from 12 means 12-(7g+11)=12-1(7g+11)=12-7g-11=12-11-7g=1-7g
5 0
2 years ago
Solve 2(a + 7) = 5a - 13
timurjin [86]

Answer:

a = 9

Step-by-step explanation:

2(a + 7) = 5a - 13

We want to bring a to one side, I will choose to bring it to the right

First, expand the bracket by multiplying 2 with a + 7

2a + 14 = 5a - 13

Bring the -13 to the left by adding 13 to both sides

2a + 14 + 13 = 5a - 13 + 13

Simplify

2a + 27 = 5a

Bring the 2a to the right by subtracting 2a from both sides

2a - 2a + 27 = 5a - 2a

Simplify

27 = 5a - 2a

27 = 3a

Bring the 3 to the left by dividing both sides by 3

27÷3 = a

Simplify

a = 9

4 0
3 years ago
X+21+3x+9 solve for x​
frez [133]

Answer:

This is not an equation. It is an expression, you can't solve for x in an expression

7 0
2 years ago
Attorney A charges a fixed fee on $250 for an initial meeting and $150 per hour for all hours worked after that. Write an equati
Anettt [7]

let h be the number of hours then

A → C = 150h + 250 ( where C is charge )

B → C = 175h + 150

for 26 hours

A → C = (150 × 26 ) + 250 = 3900 + 250 = $4150

B → C = (175 × 26 ) + 150 = 4550 + 150 = $4700

Attorney A is cheaper for 26 hours, thus better deal

Equate the 2 equations to find hours they charge the same

175h + 150 = 150h + 250 ( subtract 150h from both sides )

25h + 150 = 250 ( subtract 150 from both sides )

25h = 100 ( divide both sides by 25 )

h = 4 ← number of hours when charges for both are equal

Thus Attorney A becomes a better deal at 5 hours


3 0
3 years ago
Please help! will mark brainliest!
Anit [1.1K]
Since you add 4 each time in the x values and 1 for the y values, the answer should be 1/4
7 0
3 years ago
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