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kolezko [41]
3 years ago
7

Solve by substitution -X-4y=8 x+4y=-1

Mathematics
1 answer:
Rufina [12.5K]3 years ago
3 0

Answer:

Your answer is: No solution

Solve for the first variable in one of the equations, then substitute the result into the other equation.

Step-by-step explanation:

Hope this helped : )

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A screening test for a disease shows a positive result in 91% of all cases when the disease is actually present and in 7% of all
Jobisdone [24]

Answer:

0.0713 = 7.13% probability that the result is positive.

Step-by-step explanation:

Probability of a positive test:

91% of 1/650(has the disease).

7% of 1 - 1/650 = 649/650(does not have the disease). So

p = 0.91\frac{1}{650} + 0.07\frac{649}{650} = \frac{0.91 + 0.07*649}{650} = 0.0713

0.0713 = 7.13% probability that the result is positive.

4 0
3 years ago
Allana used Fraction 3 over 5 yard of fabric to make a scarf. Can she make 2 of these scarves with Fraction 1 and 7 over 10 yard
Paul [167]
(1 7/10) / (3/5)
(17/10) / (3/5) =
17/10 * 5/3 =
85/30 = 
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5 0
3 years ago
12а + 7x - За – 2х what's the answer<br>​
Troyanec [42]
9a-5x

step by step explanation:

you can only add and subtract numbers that have the same variables.

12a and 3a are related because there variable is both a.

when u subtract 12a-3a you get the answer of 9a using subtraction.

7x and -2x are the second pair of related terms because they also have the same variable (x)

7x-2x is 5x using subtraction.

put the expression together:

9a-5x

hope this helps!

give me brainliest if it did plz
8 0
3 years ago
17. Airlines must be aware of the weight of the aircraft plus everything on board. Based on
Arturiano [62]

Answer:

2.45 tons

Step-by-step explanation:

square root of the sum of each number squared

6 0
3 years ago
Simplify the expression.
aniked [119]
C should be the answer
3 0
3 years ago
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