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3 years ago

7

tại teamart,1 ly trà sữa có giá a đồng và 1 ly kem có giá là b đồng.Hãy viết biểu thức đại số biểu thị số tiền bạn Cúc mua 3 ly

trà sữa và 4 ly kem

1 answer:

Lesechka [4]3 years ago

8 0

Answer:

3 a + 4 b

Step-by-step explanation:

Biểu thức đại số biểu thị bạn Cúc mua 3 ly trà sữa và 4 ly kem là:

3 a + 4 b

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There are 162 magazines and books in a library. There are 54 more books

Strike441 [17]

Answer:

108 books.

Step-by-step explanation:

Let the number of magazines = m

Let the number of books = b

<u>Given the following data;</u>

Total number of m & b = 162

<em>Translating the word problem into an algebraic equation, we have;</em>

$b = m + 54$ ......equation 1

$m + b = 162$ ......equation 2

<em>Substituting equation "1" into equation "2" we have;</em>

$m + m + 54 = 162$

$2m + 54 = 162$

$2m = 162 - 54$

$2m = 108$

$m = \frac {108}{2}$

m = 54

Now to find the number of books;

$b = m + 54$

Substituting the value of "m" into the equation, we have;

$b = 54 + 54$

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3 years ago

Evaluate x2 + 3x – 7+ 8 when x = 4.

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Step-by-step explanation:

Since they have given you x = 4, simply sub it into the equation,

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= 29

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3 years ago

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3 years ago

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Anvisha [2.4K]

Answer:

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General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

<u>Algebra I</u>

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<u>Calculus</u>

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The derivative of a constant is equal to 0

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f(x) = cxⁿ
f’(x) = c·nxⁿ⁻¹

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Chain Rule: $\frac{d}{dx}[f(g(x))] =f'(g(x)) \cdot g'(x)$

Quotient Rule: $\frac{d}{dx} [\frac{f(x)}{g(x)} ]=\frac{g(x)f'(x)-g'(x)f(x)}{g^2(x)}$

Step-by-step explanation:

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Rate of change of the tangent line at point (-1, 4)

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[Algebra] Isolate <em>y'</em>: $y' = \frac{y}{-x-2}$
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Simplify: $y = \frac{4}{x+2}$

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[Algebra] Substitute in <em>y</em>: $y' = \frac{-\frac{4}{x+2} }{x+2}$
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