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ELEN [110]
3 years ago
6

Erik and Nita are playing a game with numbers

Mathematics
1 answer:
Ipatiy [6.2K]3 years ago
5 0
Great
I really like this question, cause, you know, there isn't one. But good for Erik and Nita.
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3 yards of ribbon for 1.50 how much yard would 5 yards be
LiRa [457]
It’s 2.50
because 1.50/3 is 0.50 and 0.50x5 equals to 2.50
4 0
3 years ago
Read 2 more answers
Use elimination to solve the system of equations 9x-2y=30 and x-2y=14
VashaNatasha [74]

Answer:

Step-by-step explanation:

9x - 2y = 30

x - 2y = 14

9x - 2y = 30

-x  + 2y = -14

8x = 16

x = 2

2 - 2y = 14

-2y = 12

y = -6

(2, -6)

4 0
3 years ago
Three girls, Laura, Tammy, and Jeri, can wash the family cars, clean the pool, and mow the lawn in one hour and 20 minutes. If J
Vinvika [58]
Laura DATA:
Time = x hr/job ; Rate = 1/x job/hr
Jeri DATA
Time = x+2 hr/job ; Rate = 1/(x+2) job/hr
Tammy DATA:
Time = (x+2)/2 hr/job ; Rate = 2/(x+2) job/hr.
Together DATA:
time = 4/3 hr/job ; Rate = 3/4 job/hr
EQUATION:
rate + rate + rate = together rate
1/x + 1/(x+2) + 2/(x+2) = 3/4
Multiply thru by 4x(x+2) to get:
4(x+2) + 4x + 8x = 3x(x+2)
16x + 8 = 3x^2+6x
3x^2-10x-8 = 0
3x^2-12x+2x-8 = 0
3x(x-4)+2(x-4) = 0
(x-4)(3x+2) = 0
Positive answer:
x = 4 hrs. time for Laura to do the job
x+2=6 hrs. time for Jeri to do the job
(x+2)/2 = 3 hrs. time for Tammy to do the job
7 0
3 years ago
A set of test scores are normally distributed. The mean is 100 and the standard deviation is 20. These scores are converted to s
Whitepunk [10]

Answer:

The z-scores of both the mean and the median are zero.

Step-by-step explanation:

In a normal distribution, the mean and median values will be the same, in this case, 100. Therefore, both the mean and median will have the same score.

The z-score is given by:

z=\frac{X-\mu}{\sigma}

For X = 100:

z=\frac{100-100}{20}\\ z=0

The z-scores of both the mean and the median are zero.

5 0
3 years ago
Write the linear equation in slope-intercept form given the following:<br> (-3, 7) and (6, -8)
Viefleur [7K]

Answer:

y = - \frac{5}{3} x + 2

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Calculate m using the slope formula

m = \frac{y_{2}-y_{1}  }{x_{2}-x_{1}  }

with (x₁, y₁ ) = (- 3, 7) and (x₂, y₂ ) = (6, - 8)

m = \frac{-8-7}{6+3} = \frac{-15}{9} = - \frac{5}{3} , then

y = - \frac{5}{3} x + c ← is the partial equation

To find c substitute either of the 2 points into the partial equation

Using (6, - 8) , then

- 8 = - 10 + c ⇒ c = - 8 + 10 = 2

y = - \frac{5}{3} x + 2 ← equation of line

6 0
3 years ago
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