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3 years ago

Solve the following system of equations. 3x + 2y - 5 = 0 x = y + 10

Mathematics

1 answer:

Andrej [43]3 years ago

5 0

3 (y + 10) + 2y - 5 = 0
3y + 30 + 2y - 5 = 0
1y + 30 - 5 = 0
1y + 25 = 0
1y = -25
y = -25

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If 18 is subtracted from twice the square of an integer, the

Sergeu [11.5K]

Answer:

-3/2

Step-by-step explanation:

Let x = the integer:

2x^2 - 18 = 9x

2x^2 - 9x - 18 = 0

Now either factor that or use the quadratic formula if you're lazy like me.

x = -3/2 and 6, so x must be 6 because it has to be an integer.

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2 years ago

if two dice are thrown together , what is the probability of getting an even number on one die and odd number on the other die ?

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Answer:

1/2

Step-by-step explanation:

the probability of the die rolling an even number = the probability of the die rolling an odd number =1/2

Let us name these 2 dice as A and B

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∴ The required probability

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2 years ago

What Numbers Go Into 515 ?

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3 years ago

The table shows the volume V (in cubic feet) of a cube with a side length of x feet.

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3 years ago

You are making several purchases from the I.B. Electric electronics store. You can buy from this store online or in a physical s

hammer [34]

Answer:

Online store will save the most money

Step-by-step explanation:

Amount used in Physical store

Batteries 2packs @$5.99 cost = $5.99*2=$11.98

Stereo 1 system @$100 cost = $100*1=$100

CDs 3 CDs @$7.95 cost = $ 23.85

Total cost= $11.98+$100+$23.85= $135.83

Applying the 10% off coupon = 90/100 * $135.83 =$ 122.25

Applying sale tax 5% = 105/100 * 122.25=$128.36

Amount to spend when using physical store= $128.36

Now calculate for the online store

Batteries 2packs @$4.99 cost= $4.99*2=$ 9.98

Stereo 1 system @$90 cost= $ 90 *1= $90

CDs 3 CDs @$8.95 cost = $8.95*3=$26.85

Total cost=$9.98+$90+$26.85=$126.83

Applying the 5% off coupon= 95/100*126.83=$120.49

Applying the sale tax, $6.99+$120.49=$127.48

Comparing the two ways,

Physical store= $128.36

Online store=$127.48

Online store will save the most money by ($128.36-$127.48)=0.88

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2 years ago