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EastWind [94]
4 years ago
10

HELP plz Khan Academy ;;;---;;;

Mathematics
2 answers:
insens350 [35]4 years ago
5 0

Answer:

-10b^2+12b-16

Step-by-step explanation:

b^2+8b-9-(11b^2-4b+7)

b^2+8b-9-11b^2+4b-7

b^2-11b^2+8b+4b-9-7

-10b^2+12b-16

Maslowich4 years ago
4 0

Answer:

- 10b² + 12b - 16

Step-by-step explanation:

b² + 8b - 9 - (11b² - 4b + 7) ← distribute by - 1

= b² + 8b - 9 - 11b² + 4b - 7 ← collect like terms

= (b² - 11b²) + (8b + 4b) + (- 9 - 7)

= - 10b² + 12b - 16

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96 16 81 = x 11 15 18 = y what is the value of y-2x?
qwelly [4]
Hey, im not really sure but i think it is that 1. x=96 y=11  2. x=16 y=15  3.x=81 y=18
Then you just substitute the numbers into the letters. For example,

11-96(2)= -181

15-16(2)= -17

18-81(2)= -144
3 0
3 years ago
Joyce rented a booth at a carnival at a cost of $95 to sell handmade beaded necklaces. The cost of making and packaging each bea
xz_007 [3.2K]

Answer:

To make a profit of at least $500 she must sell at least 12 necklaces

Step-by-step explanation:

Joyce rented a booth at a carnival at a cost of $95 to sell handmade beaded necklaces. The cost of making and packaging each beaded necklace was $15. If Joyce sells the beaded necklaces at $35 each then we have to find beaded necklaces she sell to make a profit of at least $500.

The costs side of the equation, we have:

Let no. of necklaces that she sell are x

∴ The cost of making and packaging x beaded necklace is $15x

Total Cost = 95+15x

Now, Joyce sells the beaded necklaces at $35 each. Therefore, selling price will be $35x

To make a profit of at least $500 the equation can be written as

95+15x+500\leq35x

595\leq50x

⇒ x\geq11.9=12

Hence,  to make a profit of at least $500 she must sell at least 12 necklaces



7 0
4 years ago
Read 2 more answers
Chinedu sat down to do his homework, which included 30 math problems. He solved 2 problems each minute. Let f(n) be the number o
Katen [24]

Answer:

14

Step-by-step explanation:

If he is solving 2 problems per minute and 8 minutes have passed, he has solved

2*8 = 16  problems

There are 30 problems and he has solved 16

30-16 = 14

There are 14 problems left to solve at the start of the 9th minute

8 0
4 years ago
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Nari says, “The sum of 10 and one-third of a number is 25.” She uses the bar model to write an equation to represent her stateme
Burka [1]
It says the sum, which hints that the two numbers will be added

So we can start the equation with 10+(1/3n)

we are then told they add up to 25
So they will equal 25

So the equation is
10+(1/3n)=25
4 0
4 years ago
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I need a set of coordinates to model a relation that is a linear function quick please.
hichkok12 [17]

Answer:

y=2x+1

Step-by-step explanation:

8 0
3 years ago
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