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4 years ago

80 is 40 percent of what number?

Mathematics

2 answers:

lilavasa [31]4 years ago

6 0

We have an equation: 80/?= 40/100

Cross multiply:
40*?= 80*100
⇒ ?= 80*100/40= 200

80 is 40% of 200~

77julia77 [94]4 years ago

3 0

0.4a=80 ----- ----- 0.4 0.4 a=200 Where a is the number times 40%, which is 0.4 in decimal form.

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A 190-pound man and a 130-pound woman went to Burger King for lunch. The man had a BK Big Fish sandwich (750 Cal), medium french

Savatey [412]

Answer:

2.25 hours for the man and 1.83 hours for the woman.

Step-by-step explanation:

We first find the number of calories consumed by both the man and the woman.

The man's calories are:

750+400+225 = 1375

The woman's calories are:

370+400+0 = 770

The man burns 610 calories per hour. This means to find the number of hours, we divide the number of calories by the rate burned per hour:

1375/610 = 2.25 hours

The woman burns 770 calories per hour. This means to find the number of hours, we divide the number of calories by the rate burned per hour:

770/420 = 1.83 hours

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3 years ago

For the expression: (− 1/x )× 1−x/1+x × x/x^2−1 Simplify the expression.

Contact [7]

Answer:

The simplified answer is $1/(x+1)^{2}$

Step-by-step explanation:

For the given expression: (− 1/x )× 1−x/1+x × x/x^2−1

we need to simplify it

$x^{2} -1$ = (x+1)×(x-1)

eliminating x and x-1 from the given equation we get

$1/(x+1)^{2}$

The value of x can't be zero

As we can't divide zero by zero

The value of x can't be one

As we can't divide zero by zero

The simplified answer is $1/(x+1)^{2}$

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3 years ago

Use sigma notation to represent the sum of a geometric series with a first term of 3 and a common ratio of . A. B. C. D.

maksim [4K]

Answer:

$\Sigma_{k=1}^{n}[3(\frac{10}{9} )^{k-1}]$

Step-by-step explanation:

A geometric sequence is a list of numbers having a common ratio. Each term after the first is gotten by multiplying the previous one by the common ratio.

The first term is denoted by a and the common ratio is denoted by r.

A geometric sequence has the form:

a, ar, ar², ar³, . . .

The nth term of a geometric sequence is $ar^{n-1}$

Therefore the sum of the first n terms is:

$\Sigma_{k=1}^{n}(ar^{k-1})$

Given a geometric series with a first term of 3 and a common ratio of 10/9, the sum of the first n terms is:

$\Sigma_{k=1}^{n}[3(\frac{10}{9} )^{k-1}]$

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3 years ago

Is the graph of the linear inequality y > -x - 3?

klasskru [66]

Answer:

Second Graph

Step-by-step explanation:

Given the linear inequality, y > -x - 3, an easier way of determining its graph is through a test point.

A test point is an ordered pair that is not on the actual line of the graph. The point of origin, (0, 0) is often used for this purpose.

Substitute the values of (0, 0) into the linear inequality to find out whether it satisfies the given inequality statement:

y > -x - 3

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0 > - 0 - 3

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Hence, the correct answer is the second graph.

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3 years ago

Question 4

andrey2020 [161]

Answer:

D : 5x³ + 5x² + x

Step-by-step explanation:

Addition and subtraction of the right coefficient of the x³ and x² terms will give you the right answer

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3 years ago