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Masteriza [31]
3 years ago
9

Select the correct answer from each drop-down menu.

Mathematics
1 answer:
storchak [24]3 years ago
3 0

Answer:

Step

Statement

1

2

3x + 7 = 15

x + 7 - 7 = 15

ža

3

= 15

4.

3

= 3.15

5

r = 45

Which statement is true?

A. Jake made a mistake in step 2.

B.

Jake made a mistake in step 4.

C.

Jake made a mistake in step 5.

OD Jake solved the equation correctly.

Answer:

If the air trolley ended at 60 km and it traveled 20 km- what was its starting position?

 

Step-by-step explanation:

 

Step-by-step explanation:

Step

Statement

1

2

3x + 7 = 15

x + 7 - 7 = 15

ža

3

= 15

4.

3

= 3.15

5

r = 45

Which statement is true?

A. Jake made a mistake in step 2.

B.

Jake made a mistake in step 4.

C.

Jake made a mistake in step 5.

OD Jake solved the equation correctly.

Answer:

If the air trolley ended at 60 km and it traveled 20 km- what was its starting position?

 

Step-by-step explanation:

 

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An electrical heating element produces heat depending on the resistance of the element and the current passed through it. The he
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The heat produced by current I is
H = I²R
where
R =  resistance.
According to the formula, heat produced is proportional to the square of the current.

When a current of I = 2 amps is applied, the heat produced is 
H = 10x³ + 80.
This heat includes heat due to a fixed current of 2 amps, and heat due to a variable current of x amps.

Because the heat produced is proportional to the square of the current, write the expressions as
H = (10x)*(x²) + 20*(2²)

The second term on the right is heat due to the fixed current of 2 amps, written as
20*(2²).
Therefore the fixed resistance is R = 20 ohms, and the square of the fixed current is 2².

The first term represents heat due to variable resistance, written as
(10x)*(x²).
Therefore the variable resistance is 10x, and the square of the variable current is x².

Answer:
The variable current is  10x.
6 0
3 years ago
Refer to the accompanying TI-83/84 Plus calculator display of a 95% confidence interval. The sample display results from using a
nikklg [1K]

Answer:

The confidence interval is 22.805

Step-by-step explanation:

We have given,

The Z interval (23.305,25.075)  

Mean \bar{x}=23.69

Sample n=30

To find : The confidence interval?

Solution :

We know, The confidence interval is in the format of

\bar{x}-E

E denotes the margin of error,

E=\frac{U-L}{2}

Where, U is the upper limit U=25.075

L is the lower limit L=23.305

E=\frac{25.075-23.305}{2}

E=\frac{1.77}{2}

E=0.885

Substitute the value of E and \bar{x} in the formula,

23.69-0.885

22.805

Therefore, The confidence interval is 22.805

8 0
3 years ago
Which of the following possibilities will form a triangle?
zhenek [66]
D will form a triangle


good luck
4 0
3 years ago
Read 2 more answers
Bill spent 70 on fertilizer and weed killer for his lawn .Each pound of fertilizer cost 50 cents and each once of weed killer co
meriva

An equation that correctly represent this relationship if x represents the number of pounds of fertilizer and y the number of ounces of weed killer is  0.5x + 3.5y = 70

<u>Solution:</u>

Given that, Bill spent 70 on fertilizer and weed killer for his lawn

Each pound of fertilizer cost 50 cents and each once of weed killer cost 3.50

We have to write an equation, if x represents the number of pounds of fertilizer and y the number of ounces of weed killer.

Now,<em> total amount = amount for fertilizers + amount for weed killers.</em>

Total amount = number of pounds of fertilizers x cost per pound + number of ounces of weed killer x cost per ounce.

\begin{array}{l}{\rightarrow 70=x \times 0.50+y \times 3.50} \\\\ {\rightarrow 0.5 x+3.5 y=70}\end{array}

Hence, the equation is 0.5x + 3.5y = 70

5 0
3 years ago
You have 3/4 of a pie leftover after your party. Each guest takes home 1/6 of the leftover pie.
Anika [276]

we know that

1) You have 3/4 of a pie leftover after your party

2) Each

guest takes home 1/6 of the leftover pie

To find the fraction of the original pie does each guest take home,

Multiply 3/4 by 1/6

so

\frac{3}{4} *\frac{1}{6} =\frac{3}{24}

<u>Simplify </u>

Divide by 3 both numerator and denominator

\frac{3}{24}=\frac{1}{8}

therefore

<u>the answer is</u>

\frac{1}{8}

8 0
3 years ago
Read 2 more answers
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