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babunello [35]
3 years ago
6

Combine the like terms to create an equivalent expression: 2r+1+(−4r)+7

Mathematics
1 answer:
dybincka [34]3 years ago
3 0

Answer:

the answer is -2r+8

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What is the area of the parallelogram?
zmey [24]
48cm2 is the answer because
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The price of a liter of milk increased 10% compared with last year . If the new price is $1.21 per liter , what was last years p
Alex Ar [27]

Answer:

$1.1

Step-by-step explanation:

First take if 110% is equals to $1.21 what about 100%

1.21×100=121÷110= $1.1

5 0
3 years ago
Y=x^2-2x-2 , find the vertex, y-intercept, and axis of symmetry
Stels [109]

Answer:

vertex=(1,-3)

y-intercept=(0,-2)

x-intercept=(1,+\sqrt{3},0)

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3 0
3 years ago
A job candidate at a large job fair can be classified as unacceptable, provisional, or acceptable. Based on past experience, a h
svp [43]

Answer:

chisquare = 31.667

degree of freedom = 2

Step-by-step explanation:

Formula for chisquare test =  (O-E)²/E

total number observations= 60 + 25 + 15 = 100                  

Estimated E,

80% x 100 = 80

15%x100 = 15

5% x 100 = 5

chisquare =

\frac{(60-80)^{2} }{80} +\frac{(25-15)^{2} }{15}+\frac{(15-5)^{2} }{5}\\

= 5 + 6.67 + 20

= 31.667

from the calculation above the value of the chisquare statistic = 31.67

the degree of freedom is the number of samples in the test  n - 1

= 3-1

= 2

I have solve this question also in a tabular form to aid understanding in the file i uploaded.

thank you and good luck!

4 0
3 years ago
· At Jefferson High School, 30% of students drive to school, 60% of students ride the bus to
Marrrta [24]

Answer:

Difference = 250 students

Step-by-step explanation:

Let the total number of students be x.

Given the following data;

% driving = 30%

% riding = 60%

% walking = 10%

Number of students driving = 375

First of all, we would determine the total number of students.

Total = 30/100 * x = 375

0.3x = 375

Total, x = 375/0.3

Total, x = 1250 students.

Next, we determine the number of students walking;

Walking = 10/100 * 1250

Walking = 12500/100

Walking = 125 students

Finally, we would determine many more students drive to school than walk to school;

Difference = 375 - 125

Difference = 250 students

3 0
3 years ago
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