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anzhelika [568]
3 years ago
9

Use mental math to approximate what a 15% tip would be for a bill of $31.99.

Mathematics
2 answers:
rodikova [14]3 years ago
5 0

The whole bill is $31.99 that is 100%. You can use mental math to determine exatcly 15% from $31.99:

1. 15%=10%+5%

2. To find 10% from $31.99 you should simply divide $31.99 by ten. Thus, 10% from $31.99 is $3.199.

3. 5% is half of 10%, then 5% from $31.99 is $3.199:2=$1.5995.

4. 15% from $31.99 is $3.199+$1.5995=$4.7985≈$4.80.

Answer: correct choice is B.

Mrrafil [7]3 years ago
4 0
Letter B bc if you do the actual math it comes to be 4.79 so mentally you would give a 4.80 tip
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The reason is because of what each of these statements represent in math.

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3 0
3 years ago
Dr. Jones has found over the years that 95% of babies delivered weighted x pounds, where |x-8.2| - 1.5 < 0.....Solve the ineq
larisa86 [58]

Answer:

6.7.

Step-by-step explanation:

We have been given an inequality |x-8.2|-1.5 and we are asked to solve our given inequality.

Let us add 1.5 to both sides of our inequality.

|x-8.2|-1.5+1.5

|x-8.2|

Upon using definition of absolute value function |f(x)| we can write our absolute function as:

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x-1.5+8.2  

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6 0
3 years ago
Slove all of it please 100 points
Katyanochek1 [597]

Answer:

Step-by-step explanation:

5x+y-7=0 isolate y

y=-5x+7 (m=-5,b=7)

9x+7y-14=0

7y=14-9x ( divide both sides by 7)

y=-9x/7 +14/7

y=-9/7 + 2  (m=-9/7, b=2)

x+y=1000

4x+3y=3600 ( multiply the first equation by 3 to eliminate y)

3x+3y=3000

4x+3y=3600 ( subtract the two equations)

3x+3y-(4x+3y)=3000-3600

3x+3y-4x-3y=-600

-x=-600

x=600 ( substitute x in the equation)

x+y=1000

600+y=1000

y=1000-600=400

check : x+y=1000 , (600+400)=1000

check : 4x+3y=3600 = (4(600)+3(400))=2400+1200=3600

how many tickets are sold :

adults x=600/4=150

kids (y)=400/3=133 tickets+1 dollars left

unless( x represent kids then x=200, y represent adult = 100)

4 0
3 years ago
Read 2 more answers
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