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Montano1993 [528]
3 years ago
10

Please explain all work and will get brainiest

Mathematics
1 answer:
ss7ja [257]3 years ago
6 0
1) You need to graph this one in order to find out the ordered pair. Your y-intercept is positive 4, so that's where you should start. From there, your slope is negative 11 so you'll go down 11 times and move one over. The line should go across the ordered pair of (1, -7). So, your answer is C (1, -7).

2) c = 65h
In this equation, c represents the total cost. 65 is the price charged per hour to fix a leak. So, if I were to say it took a plumber two hours to fix a leak then my equation would be:

c = 65(2)
c = 130

Thus, the cost is $130.

3) The problem says solve for x, however, I don't see the input of x anywhere.

4) c = b - bx

c = b(1-x)

c/b = 1 - x

c/b - 1 = -x

-c/b + 1 = x

This equation is read as: negative c over b plus 1 equals x
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One researcher wishes to estimate the mean number of hours that high school students spend watching tv on a weekday. a margin of
PtichkaEL [24]
Margin of error, e = Z*SD/Sqrt (N), where N = Sample population

Assuming a 95% confidence interval and substituting all the values;
At 95% confidence, Z = 1.96

Therefore,
0.23 = 1.96*1.9/Sqrt (N)

Sqrt (N) = 1.96*1.9/0.23

N = (1.96*1.9/0.23)^2 = 262.16 ≈ 263

Minimum sample size required is 263 students.

3 0
3 years ago
Read 2 more answers
I'd really appreciate some help on these questions, I'm really struggling
nikklg [1K]
We can use linear combinations of the equations to eliminate variables.

3x - 4y = 1
-2x + 3y = 1

To eliminate y we'll make the linear combination of 3 times the first equation minus four times the second. 

9x - 12y = 3
-8x + 12y = 4

Adding,
x = 7

We could solve for y directly but let's use another linear combination, twice the first plus three times the second:

2(3x - 4y) + 3(-2x + 3y)= 2(1)+3(1)

y = 5

Check: 3(7)-4(5)=1 good.   -2(7)+3(5)=1 good.

Q18 Answer: (7,5)

y = -3x + 5
5x - 4y = -3

4y +1(5x - 4y) = 4(-3x + 5) + 1(-3)

5x = -12x + 20 -3

17 x = 17

x = 1
y = -3(1) + 5 = 2
Check: 5(1) - 4(2) = -3 good

Q19 Answer (1,2)

6x + 5y = 25
x = 2y + 24
6x = 12y + 144
5y = 25 - 12y - 144
17y = -119
y = -119/17= -7
x = 2y+24= 10
Check: 6(10)+5(-7)=25 good   2y+24=2(-7)+24=10=x good

Q20 Answer (10,-7)


3x + y = 18
-7x + 3y = -10
9x  + 3y = 54
9x - -7x = 54 - -10
16x = 64
x=4
y = 18 -3x = 18-12=6

Check: 3(4)+6=18 good,  -7(4)+3(6)=-10 good

Q21 Answer: (4,6)

6 0
3 years ago
In the similar quadrilaterals below, what is the measure of ∠G?
arsen [322]

Answer:

what

Step-by-step explanation:

3 0
2 years ago
Simplify. (-2y^3)^3(-3x^2yz^2)^3
Alik [6]

=-8y^9*-27x^6y^3z^6

=216x^6y^12z^6

6 0
3 years ago
Write three ratios equal to 5/40
AnnZ [28]
The answer is

<span>A. 2/14, 3/21, 4/28

B. 1/8, 2/16, 3/24

C. 1/9, 2/18, 3/27

D. 5/40, 5/45, 5/50</span>

7 0
3 years ago
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