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Anna35 [415]
3 years ago
9

Which ordered pair is a solution to the system of equations? A (1,3) B (7, -5) C (8,2) D (-2, -3)

Mathematics
1 answer:
photoshop1234 [79]3 years ago
8 0
2x - y = -1
2x - 4y = 8
-------------------subtract
3y = -9
y = 3

2x - y = -1
2x - 3 =-1
2x = 2
x = 1

solution (1,3)
so answer A

You got it right
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We are given a weighted coin (with one side heads, one side tails), and we want to estimate the unknown probability pp that it w
Kamila [148]

Answer:

0.4060

Step-by-step explanation:

To calculate the sample proportion, phat, we take the ratio of the number of preferred outcome to the total number of trials ;

Phat = number of times coin lands on head (preferred outcome), x / total number of trials (total coin flips), n

x = 406

n = 1000

Phat = x / n = 406/ 1000 = 0.4060

5 0
3 years ago
Luis wants to buy a skateboard that usually sells for 79.99. All merchandise is discounted by 12% . What is the total cost of th
Brrunno [24]
Ok so first, the skateboard costs $79.99. The skateboard costs 12% less with discount now so you have to pay 12% less.

You start by finding 12% of 79.99. This can be easily done by hand or with a calculator. Do 0.12 times 79.99. The answer is 9.5988. Since its 12% less we now subtract $9.5988 from $79.99. We get $70.3912. So this is the discounted price.

Now for the state sales tax. The sales tax is 6.75% which is equal to 0.0675. Like we did before, we multiplied .0675 by the value we wanted this percent of. But we can do a short way instead. Instead of getting 6.75% of $70.3912 and then adding it back to $70.3912, we can multiply $70.3912  by 1.0675 and this will do all the work for us.

So now, do $70.3912  times 1.0675 and you will have the answer. The answer is $75.142606, but wait, now we will round this to hundredths place as cents place ends their, and so the final answer will be $75.14.
4 0
4 years ago
Joe works as a plumber. He charges $45 per hour for a house call. You can use the equation c = 45h to determine the total amount
STatiana [176]

Answer:

D. 12 hours

Step-by-step explanation:

You divide the total he made by how much he charges per hour to find out how many hours he worked.

540 divided by 45 equals 12.

4 0
3 years ago
GEOMETRY HELP !! WHAT IS ANGLE PTX ? PLEASE EXPLAIN!!!BRAINLIEST GIVEN!!!
Alex73 [517]

The angle is 60° because it is one of three angles that make up an equilateral triangle.

Hope this helps! :)

5 0
4 years ago
Read 2 more answers
Solve the following systems of equations algebraically. Write your answer in the form of (x, y).
Ne4ueva [31]

Let's solve your system by substitution.
y
=
3
x
+
5
;
y
=
x
+
19

Step: Solve
y
=
3
x
+
5
for y:
y
=
3
x
+
5

Step: Substitute
3
x
+
5
for
y
in
y
=
x
+
19
:
y
=
x
+
19
3
x
+
5
=
x
+
19
3
x
+
5
+
−
x
=
x
+
19
+
−
x
(Add -x to both sides)
2
x
+
5
=
19
2
x
+
5
+
−
5
=
19
+
−
5
(Add -5 to both sides)
2
x
=
14
2
x
2
=
14
2
(Divide both sides by 2)
x
=
7

Step: Substitute
7
for
x
in
y
=
3
x
+
5
:
y
=
3
x
+
5
y
=
(
3
)
(
7
)
+
5
y
=
26
(Simplify both sides of the equation)

Answer:
x
=
7
and
y
=
26
8 0
3 years ago
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