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ruslelena [56]
3 years ago
12

The difference between an observational study and an experiment is that

Mathematics
1 answer:
lorasvet [3.4K]3 years ago
7 0

Answer:

I think it's the last one! In an experiment, one group is studied over a short period of time---

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Help please!!!!!!!!!!!!!
nydimaria [60]
1. statement: angles 1 and 2 are supplementary, reason: adjacent angles on a straight line are supplementary
2. reason: Vertical angles are congruent
3. reason: Parallel lines for supplementary interior angles on the same side as the transverse
4. statement:angles 1 and 5 are equal reason:If two angles are supplementary to the same angle, they are congruent
5 0
3 years ago
Help please with algebra problem
Strike441 [17]
Number of weekend minutes used: x
Number of weekday minutes used: y

This month Nick was billed for 643 minutes:
(1) x+y=643

The charge for these minutes was $35.44
Telephone company charges $0.04 per minute for weekend calls (x)
and $0.08 per minute for calls made on weekdays (y)
(2) 0.04x+0.08y=35.44

We have a system of 2 equations and 2 unkowns:
(1) x+y=643
(2) 0.04x+0.08y=35.44

Using the method of substitution
Isolating x from the first equation:
(1) x+y-y=643-y
(3) x=643-y

Replacing x by 643-y in the second equation
(2) 0.04x+0.08y=35.44
0.04(643-y)+0.08y=35.44
25.72-0.04y+0.08y=35.44
0.04y+25.72=35.44

Solving for y:
0.04y+25.72-25.72=35.44-25.72
0.04y=9.72

Dividing both sides of the equation by 0.04:
0.04y/0.04=9.72/0.04
y=243

Replacing y by 243 in the equation (3)
(3) x=643-y
x=643-243
x=400


Answers:
The number of weekends minutes used was 400
The number of weekdays minutes used was 243
6 0
2 years ago
Which of the following pairs of triangles can be proven congruent through SSS?
Anni [7]

Answer:

B

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
If you are receiving $57.94 in change, what is the lowest combination of bills and coins that will still give you the correct ch
mestny [16]

1   50 dollar bill

1    5 dollar bill

2   1 dollar bills

3    quarters

1      dime

1       nickel

4      pennies




7 0
3 years ago
Which is the best way to solve the equation x2 = n?
Gnom [1K]

n - no solutions in real numbers

n=0 \Rightarrow x=0

n>0 \Rightarrow x=\sqrt n \vee x=-\sqrt n

7 0
3 years ago
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