3 years ago

Solve the equation. Show all Work. (4 points)

Mathematics

1 answer:

Ber [7]3 years ago

7 0

Answer:

Step-by-step explanation:

7x + 3(-x + 6) = 42

use distributive property

7x + -3x + 18 = 42

positive + negative = negative

7x - 3x + 18 = 42

combine like terms

4x + 18 = 42

subtract 18 from both sides

4x + 18 - 18 = 42 - 18

18 is canceled out on the left side

4x + 0 = 24

4x = 24

divide both sides by 4

4x ÷ 4 = 24 ÷ 4

1x = 6

x = 6

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A sweatshirt originally priced at $28.00 is on sale for $22.00. What is the percent of decrease, rounded to the nearest whole nu

Masteriza [31]

Answer:

B 21%

Step-by-step explanation:

Decrease = original price minus new price

divide the decrease by the original amount and then multiply by 100.

decrease = 28-22. Decrease = $6

6/28 = .2142857

.2142857 x 100 = 21.42857%

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4 years ago

Please help to answer this question. 15 points

lisabon 2012 [21]

7. 8+7=15 and 15/2=7.5 BUT they are asking for FULL LESSONS so it cannot be a decimal. Therefore it is 7.

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3 years ago

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Find the area of the figure. Round to the nearest tenth if necessary. Use 3.14 for pi . 47.3 units2 41.1 units2 57.1 units2 66.2

Studentka2010 [4]

Answer:

41.1 units

Step-by-step explanation:

find the area of the triangle

1/2BH

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4*4=16

find the area half of the circle

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3.14*4^2

3.14*16

50.24/2

^because it is a half circle you divide by 2

25.12+16=41.1

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4 years ago

Classify this expression based on the number of terms: 4a^2+9ab^2-15b^3. A.Monomial B.Binomial C.Trinomial D.Polynomial

kirza4 [7]

It is a trinomial because it has 3 terms.

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3 years ago

Please help! i need to find the mean

irina1246 [14]

Answer:

Step-by-step explanation:

$\overline x =\dfrac{-3\cdot4+(-2)\cdot2+3\cdot1+4\cdot1+6\cdot4+8\cdot7}{4+2+1+1+4+7}\\\\\\\overline x =\dfrac{-12-4+3+4+24+56}{19}\\\\\\\overline x =\dfrac{71}{19}=3.7368421....\approx3.74$

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4 years ago