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3 years ago

I'm helping my sister with her math homework and I'm stuck in this one... someone please help

Mathematics

1 answer:

ki77a [65]3 years ago

7 0

The answer could be 27 for the first 3 and 8 for the last one

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Solve the simultaneous equations -x + 4y = 12 x + y = - 7

blondinia [14]

Answer:

y = 1, x = - 8

(-8, 1)

Step-by-step explanation:

-x + 4y = 12

x + y = -7

add the equations together

0x + 5y = 5

5y = 5

y = 1

substitute y for 1 in one of the original equations to find x

x + y = -7

x + 1 = -7

x + 1 - 1 = - 7 - 1

x = - 7 - 1

x = -8

7 0

3 years ago

What is 0.194 with only thhe 9 and 4 repeating as a fraction?

nirvana33 [79]

193/990 Would be the answer. If you want the steps to find it, just ask.

5 0

3 years ago

You place a billiard cue against a billiard table. The foot of the billiard cue is 15 cm away from the table and the top of the

Luba_88 [7]

Answer:

-4

Step-by-step explanation:

The billiard cue is 15 cm away from the table

This refers to coordinates of (15, 0)

The billiard cue touches the table at a point 60 cm off the ground

This refers to coordinates of (0, 60)

The slope is as per slope formula;

m = (60 - 0)/(0-15) = 60/ -15 = -4

Thea answer is -4

6 0

3 years ago

Read 2 more answers

A random sample of 85 group leaders, supervisors, and similar personnel revealed that a person spent an average 6.5 years on the

strojnjashka [21]

Answer:

95% of confidence interval for the Population

( 6.1386 , 6.8614)

Step-by-step explanation:

Step( i ):-

Given random sample size 'n' =85

Mean of the sample size x⁻ = 6.5 years

Standard deviation of Population = 1.7 years

Level of significance = 0.95 or 0.05

Step(ii):-

95% of confidence interval for the Population is determined by

$(x^{-} - Z_{0.05} \frac{S.D}{\sqrt{n} } , x^{-} + Z_{0.05} \frac{S.D}{\sqrt{n} })$

$(6.5 - 1.96\frac{1.7}{\sqrt{85} } , 6.5 + 1.96 \frac{1.7}{\sqrt{85} })$

( 6.5 - 0.3614 , 6.5 + 0.3614 )

( 6.1386 , 6.8614)

Conclusion:-

95% of confidence interval for the Population

( 6.1386 , 6.8614)

8 0

3 years ago

What is the value of y in the solution to the system of equations? 1/3x+1/4y=2 2x – 3y = –30 –8 –3 3 8

ludmilkaskok [199]

Answer:

8 i'm pretty sure

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers