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3 years ago

9

Hi i want to ask you something Emma wrote thirty-six thousand,forty-two as 3,642.Explain what she did wrong.Then write the numbe

r correctly.

2 answers:

nirvana33 [79]3 years ago

4 0

She did not put 36 as a thousand. The real answer is 36,042

velikii [3]3 years ago

4 0

Answer:

Hi.

thirty-six thousand,forty-two is written as 36,042.

3,642 is three thousand, six hundred forty-two.

Step-by-step explanation:

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How many liters each of a 35% acid solution and a 80% acid solution must be used to produce 60 liters of a 65% acid solution? (R

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Solving a system of equations we will see that we need to use <u>40 liters of the 80% acid solution</u>, and the other <u>20 liters are of the 35% acid solution</u>.

<h3>How many liters of each solution do we need to use?</h3>

First, we need to define the variables:

x = liters of the 35% acid used.
y = liters of the 80% acid used.

We know that we want to produce 60 liters of 65% acid, then we have the system of equations:

x + y = 60

x*0.35 + y*0.80 = 60*0.65

(in the second equation we wrote the percentages in decimal form).

To solve this we need to isolate one of the variables in one equation and then replace it in other one, isolating x we get:

x = 60 - y

Replacing that in the other equation:

(60 - y)*0.35 + y*0.80 = 60*0.65

y*(0.80 - 0.35) = 60*(0.65 - 0.35)

y*0.45 = 60*0.30

y = 60*0.30/0.45 = 40

So we need to use <u>40 liters of the 80% acid solution</u>, and the other <u>20 liters are of the 35% acid solution</u>.

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Step-by-step explanation:

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<em>Complete Question:</em>

<em>Which situation can be represented by the inequality x > 56</em>

A. Phil's saving account balance is $56

B. Junichi's garden is wider than 56 ft.

C. Suzanna hiked for less than 56 min.

D. It was colder than 56ºF this morning.

Answer:

Option B

Step-by-step explanation:

Given

$x > 56$

Required

Represent using a real life situation

$x > 56$ implies that the value of x is greater than 56

Examining the options one after the other

a: Account balance is $56

This option shows equality

i.e.

$x = 56$

b: Garden is wider than 56 ft.

Being wider than 56 means being greater 56;

This option shows greater than

So:

$x > 56$

c. Hiked for less than 56 min.

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$x < 56$

d. Colder than 56ºF this morning.

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