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Tresset [83]
3 years ago
8

PLEASE HELP-20 POINTS

Mathematics
1 answer:
avanturin [10]3 years ago
4 0
1.) m + n = 5
m - 3 = n

m + m - 3 = 5
2m - 3 = 5
2m = 8
m = 4

m + n = 5
4 + n = 5
n = 1

Therefore m =4 and n =1

2.) I don't think this one can be done because:
6x - 2(3x - 7) = 12
6x - 6x + 14 = 12
0x + 14 = 12
0x = - 2

3.) 5x + 2(x + 7) = 7
5x + 2x + 14 = 7
7x + 14 = 7
7x = - 7
x = - 1

y = x + 7
y = - 1 +7
y = 6

Therefore x = - 1 and y = 6

4.) I don't think this one can be done either because:
14 - 4x = 2y
Is the same as:
7 - 2x = y
Which is the same as the first equation. You then get 0x because if you substitute y in:
7 - 2x + 2x =7
7 = 7

5.) y = 4x + 6
5x - 4x + 6 = 6
x +6 = 6
x = 0

y = 4x + 6
y = (4x0) + 6
y = 6

Therefore x = 0 and y = 6
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melisa1 [442]
It is one hundred times greater, 7000= 70 x 100
7 0
3 years ago
HELP ASAP PLSSSSSSSSSS
inysia [295]

Answer:

Neighborhood Q appears to have a bigger family size

Step-by-step explanation:

Mean = the sum of all data values divided by the total number of data values

Number of families in Neighborhood Q = 9

Mean family size of Neighborhood Q:

= (2 + 5 + 4 + 3 + 2 + 5 + 3 + 6 + 5) ÷ 9

= 35 ÷ 9

= 3.888888...

Number of families in Neighborhood S = 9

Mean family size of Neighborhood S:

= (2 + 3 + 2 + 3 + 7 + 2 + 3 + 3 + 2) ÷ 9

= 27 ÷ 9

= 3

The mean family size of Neighborhood Q is 3.88..  and the mean family size of Neighborhood S is 3.  Therefore, Neighborhood Q appears to have a bigger family size as it's average family size is bigger than that of Neighborhood S.

6 0
2 years ago
The function h(t)=-4.92t^2+17.69t+575 is used to model an object being tossed from a tall building, where h(t) is the height in
nikklg [1K]
We have the following equation:
<span> h(t)=-4.92t^2+17.69t+575

</span> For the domain we have:
<span> </span>We match zero:
 -4.92t ^ 2 + 17.69t + 575 = 0
 We look for the roots:
 t1 = -9.16
 t2 = 12.76
 We are left with the positive root, so the domain is:
 [0, 12.76]

 For the range we have:
 We derive the function:
 h '(t) = - 9.84t + 17.69
 We equal zero and clear t:
 -9.84t + 17.69 = 0
 t = 17.69 / 9.84
 t = 1.80
 We evaluate the time in which it reaches the maximum height in the function:
 h (1.80) = - 4.92 * (1.80) ^ 2 + 17.69 * (1.80) +575
 h (1.80) = 590.90
 Therefore, the range is given by:
 [0, 590.9]

 Answer:
 the domain and range are:
 
domain: [0, 12.76] range: [0, 590.9]
5 0
3 years ago
Read 2 more answers
Please help, Easy maths.
svetoff [14.1K]

Answer:

x-5y

Step-by-step explanation:

6x-8y-5x+3y

Add or subtract like terms.

1x-5y

8 0
3 years ago
Read 2 more answers
What is x/8 = - 8 <br> = to
FrozenT [24]
Answer -64


step by step:
3 0
3 years ago
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