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Usimov [2.4K]
3 years ago
10

Solve for a: a/2 - 2/3 = a + 1/5

Mathematics
2 answers:
lapo4ka [179]3 years ago
7 0
Combining like terms, move the one with coefficient a to the left, and move the constant to the right
\dfrac{a}{2} -  \dfrac{2}{3} =a+ \dfrac{1}{5}
\dfrac{a}{2} - a =\dfrac{1}{5} + \dfrac{2}{3}

equalize the denominators in like-terms
\dfrac{a}{2} - \dfrac{2a}{2} =\dfrac{1 \times 3}{5 \times 3} + \dfrac{2 \times 5}{3 \times 5}
\dfrac{a}{2} - \dfrac{2a}{2} =\dfrac{3}{15} + \dfrac{10}{15}

do the operation to the numerators
\dfrac{-a}{2} =\dfrac{13}{15}

solve for a
-a = \dfrac{13}{15} \times 2
-a = \dfrac{26}{15}
a = - \dfrac{26}{15}
ki77a [65]3 years ago
3 0
The answer is 4 if I am correct
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Use differentials to approximate the value of the expression. Compare your answer with that of a calculator. (Round your answers
Vesna [10]

Answer:

726.572699

Step-by-step explanation:

According to differentials

(x+Δx)³ = x³ + 3x²Δx + 3x(Δx)² + (Δx)³ (Using binomial expansion)

Using this formula to solve (8.99)³, this can also be written as;

(8.99)³ =  (9-0.01)³ where

x = 9

Δx = -0.01

Substitute this vales into the differential expression above

(9+(-0.01))³ = 9³ + 3(9)²(-0.01) + 3(9)(-0.01)² + (-0.01)³

(9+(-0.01))³ = 729 + (243)(-0.01) + 27(0.0001) + (-0.000001)

(9+(-0.01))³ = 729-2.43+0.0027-0.000001

(9+(-0.01))³ = 729-2.43+0.0027-0.000001

(9+(-0.01))³  = 726.572699

Hence 8.99³ = 726.572699 (Using differential)

Using calculator;

8.99³ = 726.572699

4 0
3 years ago
PLEASE HELP<br> find the vertex of f(x)=x^2+2x+3 (make sure you show your work)
kotegsom [21]

Answer:

(- 1, 2)

Step-by-step explanation:

Given a quadratic in standard form y = ax² + bx + c : a ≠ 0

Then the x- coordinate of the vertex is

x_{vertex} = - \frac{b}{2a}

f(x) = x² + 2x + 3 ← is in standard form

with a = 1 and b = 2, hence

x_{vertex} = - \frac{2}{2} = - 1

Substitute x = - 1 into f(x) for corresponding value of y

f(- 1) = (- 1)² + 2(- 1) + 3 = 1 - 2 + 3 = 2

vertex = (- 1, 2 )

4 0
3 years ago
If (7^ 0)=1what are the possible values of x
olchik [2.2K]
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Explanation: anything to the power of 0 is 1 so if it is x to the power of 0 it would be 1
7 0
3 years ago
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In a cafeteria 3/10 of the students are eating salads, and 3/5 are eating sandwiches. There are 20 students in the cafeteria. Ho
Elanso [62]

We know that 3/10*20=6 students are eating salads.

We also know that 3/5*20=12 students are eating sandwiches.

Assuming each person only eats one thing, there are 20-12-6=2 students eating lunches other than salads or sandwiches.

8 0
4 years ago
Write the following decimal number in its equivalent fraction form. Show all work for full credit. 0.225
zalisa [80]
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Multiplying by 1 to eliminate 3 decimal places, we multiply top and bottom by 103 = 1000

0.2251×10001000=2251000


7 0
3 years ago
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