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nasty-shy [4]
4 years ago
11

Please help I don't understand 120 - 28a = 78

Mathematics
2 answers:
stiks02 [169]4 years ago
6 0
Simplifying
120 + -28a = 78

Solving
120 + -28a = 78

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-120' to each side of the equation.
120 + -120 + -28a = 78 + -120

Combine like terms: 120 + -120 = 0
0 + -28a = 78 + -120
-28a = 78 + -120

Combine like terms: 78 + -120 = -42
-28a = -42

Divide each side by '-28'.
a = 1.5

Simplifying
a = 1.5
Gemiola [76]4 years ago
4 0
120 - 28a = 78
28a = 120-78
28a = 42
a =  \frac{42}{28}  \\ a =  \frac{3}{2}
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Answer:

C

Step-by-step explanation:

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SA=3.14*9+3.14*24

SA=103.62

SA= about 104 inches

Aubrey included the base (you can't put on a hat that has a bottom), the right work should be:

SAhat=pi*r*s

SAhat=3.14*3*8

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Thus, answer is C

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3 years ago
Decide whether each table could represent a proportional relationship. In the essay box explain if the relationship could be pro
TEA [102]

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This table does represent a proportional relationship because the sale price and original price are going up at the constant rate of 10

Step-by-step explanation:

3 0
3 years ago
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Sergeeva-Olga [200]

Simplify √-y to √yi

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Square bot sides

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9 + 12y + 4y^2 = -y

Move all terms to one side

9 + 12y + 4y^2 + y = 0

Simplify 9 + 12y + 4y^2 + y to 9 + 13y + 4y^2

9 + 13y + 4y^2 = 0

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Factor out common terms in the first two terms, then in the last two terms

y(4y + 9) + (4y + 9) = 0

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(4y + 9)(y + 1) = 0

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y = -9/4, -1

Check solution

when y = -9/4, the original equation; 3 + 2y = √-y does not hold true. We will drop y = -9/4 from the solution set.

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4 years ago
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kirza4 [7]

Answer:

tan M = \frac{24}{7}

Step-by-step explanation:

To obtain tan M we require to find KL

Using Pythagoras' identity in the right triangle.

KL² + LM² = KM²

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KL² + 49 = 625  ( subtract 49 from both sides )

KL² = 576 ( take square root of both sides )

KL = \sqrt{576} = 24

Then

tan M = \frac{opposite}{adjacent} = \frac{KL}{LM} = \frac{24}{7}

3 0
3 years ago
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Answer:

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This means that 4 GB were used beyond 20 GB.

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