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aleksandrvk [35]
3 years ago
8

Rachel buys 30 nuts and bolts to finish a project. If each but costs 10 cents, each bolt costs 20 cents and the total purchase p

rice is $4.20, how many nuts and bolts does she buy?
Mathematics
1 answer:
Natali5045456 [20]3 years ago
3 0

Answer:

12 bolt 18 nuts

Step-by-step explanation: (Elimination method)

N=nuts

B=bolts

B + N = 30

0.20B + 0.10N = 4.20

20B+10N=420 (I multiplied by 10 to eliminate decimals

-------------------------------------------------------

I  will multiply the first  by (-10)

-10B  -10N =-300

20N +10N=420

10B+0 = 120

B=12 (12 BOLT)

30-12 =18   (8 NUTS)

12*0.20=2.40

18*0.10=1.80

2.40+ 1.80 = 4.20

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Please help
irina [24]

Answer:

x^2 -2xy -10y^2

x^2 -9xy +4 y^2

3x^3  +6x^2  -24 x +27

Step-by-step explanation:

3x^2-5xy -6y^2 -( 2x^2 -3xy+4y^2)

= 3x^2- 2x^2 -5xy +3xy-6y^2 -4 Y^2

= x^2 -2xy -10y^2


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8 0
4 years ago
What value of n will make 3n = -15 a true statement ?
hammer [34]

Answer:

n = -5

Step-by-step explanation:

Divide both sides by 3 to get x by itself

3 0
4 years ago
Read 2 more answers
Brad had a small gathering at a local steakhouse. The steakhouse offers three dinner platters which vary by size and price. They
kherson [118]

Hello!

If Brad had a small gathering at a local steakhouse where they ordered 4 of the 6-ounce platters, 3 of the 8-ounce platters, and 2 of the 11-ounce platters. After adding an 18% gratuity their total before sales tax should have been $130.45

Step-by-step explanation:

4 x 9.95=39.80

3 x 12.95=38.85

2 x 15.95=31.90

31.90+38.85+39.80=110.55

110.55 x 0.18 =19.899

110.55+19.90=130.45

5 0
1 year ago
Let
Brilliant_brown [7]

The set A ∩ (/B ∪ C) is given as { 1, 6 }

<h3>How to determine the elements of the set</h3>

From the information given, we have the sets as;

U= {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

A= {1, 2, 4, 6}

B= {3, 7}

C= {1, 3, 6, 7, 8}

Note that;

  • U is the universal set
  • Sets A, B and C are subsets of the universal set
  • ∪ represents union of the set
  • ∩ represents intersection of set

B∪C = { 1, 3, 6, 7, 8}

A ∩ (/B ∪ C) = { 1, 6 }

Hence, the set is { 1, 6 }

Learn more about sets here:

brainly.com/question/13458417

#SPJ1

8 0
1 year ago
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