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AURORKA [14]
3 years ago
11

a school cafeteria has 40 tables 35% of the tables have eight chairs at each table their remaining 65% of the tables have six ch

airs at each table complete the model then complete the statement to find the total number of chairs in the cafeteria
Mathematics
1 answer:
Romashka [77]3 years ago
7 0
268 chairs In the cafeteria
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Can u help me with these anwsers
nydimaria [60]
Check your work here:
1)7/8.
7/8=0.875 and 3/4=0.75
2)3/20.
3/20=0.15 and 12.5%=0.125
3)48.4
increase by 10% means you multiply 44 by 100%+10% or 110% to get 48.4
4)612
decrease by 10% means you multiply 680 by 100%-10% or 90% to get 612
5)36,36,60
132/(3+3+5)*3,132/(3+3+5)*3,132/(3+3+5)*5
6)9.6,22.4
32/10*3, 32/10*7
7)20
14/0.7
8)31.5
18/4*7
9)17/12
2/3=8/12, 3/4=9/12 8/12+9/12=17/12
10)15/4
5*3/4
11)8
2^2+2*2=4+4=8
12)0
(-2)^2+(-2)*2=4-4=0
13)3
3(x-3)=0,(x-3)=0,x=3
14)2/5 or 0.4
5x+1=3,5x=2,x=2/5
15)5n+2
The sequence difference is 5 and the first term is 7
16)20
6(3)+2=18+2=20
17)-5
4(-2)+3=-8+3=-5
18)1
the coefficient of x is 1
19)4pi or 12.56
area of a circle is r^2*pi=2^2*pi=4pi
20)14pi or 43.96
circumference of a circle=2r*pi=2*4*pi=14pi
8 0
3 years ago
What is the value of -(-9)?<br> Explain your reasoning.
Ymorist [56]

Answer:

-(-9) is 9

Step-by-step explanation:

-(-9)

(when there are two negatives multiplyed with eachother, the product will be postive)

+ 9

+ 9  = 9

8 0
3 years ago
Read 2 more answers
Michele correctly solved a quadratic equation using the quadratic formula as shown below.
Fofino [41]

Answer:

The original equation must have been:

7x^{2} -5x-2=0

Step-by-step explanation:

A quadratic equation is in the form of :

ax^{2} +bx+c=0

And it is solved in the form of :

x=\frac{-b+\sqrt{b^{-4ac} } }{2a} and x=\frac{-b-\sqrt{b^{-4ac} } }{2a}

Now the given equation is :

x=\frac{-(-5)+-\sqrt{(-5)^{2} -4(7)(-2)} }{2(7)}

We can see that here;

a = 7

b = -5

c = -2

So, the original equation must have been:

7x^{2} -5x-2=0

5 0
3 years ago
How do you find 79% of 32
liubo4ka [24]

Convert 79% to a decimal which is .79

Then you multiply .79 by 32 which is 25.28

Your answer is 25.28

5 0
3 years ago
Three times a number plus 16
DochEvi [55]
To solve this, we simply need to break down the words and turn each part into an equation.

"Three times"
This shows that we will be multiplying 3 and something.
3*

"a number"
This shows that the number we will be multiplying 3 by is "n," which represents a number.
3*n or 3n

"plus 16"
This shows we will be adding 16 to the rest of the equation.
3n+16

Using the logic above, we can see that the equation to represent this is 3n+16.
7 0
3 years ago
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