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3 years ago

6

Solve for y: 2(3y 5)=3(5y 13)

1 answer:

ELEN [110]3 years ago

3 0

Assuming the spaces mean plus (+):

2(3y+5) = 3(5y+13)
6y+10 = 15y+39
10 = 9y+39
9y = -29
Therefore, y = -29/9 or -3.22

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Mark's brother is 5 years older than mark their combined ages add up to 23 how old is my make sure you have expression for Mark

3241004551 [841]

Answer:

Mark is 9 and his brother is 14.

The expression for Mark: 23 - 9 = 14

The expression for his brother: 23 - 14 = 9

Step-by-step explanation:

We know that 14 is 5 more than 9, and Mark is the younger one so he would be 9 and his brother 14. 9 + 14 also equals 23, so thats how you know you have the right answers.

6 0

3 years ago

The simple interest earned on $500 at 6% for 18 months?

Marat540 [252]

Ok, the formula we'll use is:

I (interest) = P (principle) x R (rate) x T (time in years)

so we know p, r, and t... this is an easy one... no formula rearranging or anything!! :)

I = $500 x 6% x 18/12

I've put 18 over 12 because the time has to be in years therefore, you divide 18 months by 12 months to get it in years which is 1.5 years.

I = $45

7 0

3 years ago

The dimensions of Sara's apartment are22 1/2 feet by 25 feet. In the scale drawing below,1 1/2 inches is equivalent to 15 feet.

expeople1 [14]

Answer:

Step-by-step explanation:

Given:

The scale 1 1/2 ( $\frac{3}{2}$ ) inches = 15 feet

<=> 1 inch = $\frac{15 feet}{\frac{3}{2} }$ = 10 feet.

<=> 1 feet = $\frac{1}{10}$ inch

The dimensions of Sara's apartment are 22 1/2 ( $\frac{45}{2}$ ) feet by 25 feet, so the new dimensions of Sara's apartment by inches are:

( $\frac{45}{2}$ ) feet = $\frac{45}{2}$ * $\frac{1}{10}$ = $\frac{9}{4}$ inches
25 feet = 25* $\frac{1}{10}$ = $\frac{5}{2}$ inches

Hope it will find you well.

7 0

3 years ago

A speedometer has a percent error of 10%. The actual speed of the car is 40 mph. Select from the drop-down menus to correctly co

rodikova [14]

Answer

Answer

The speedometer is likely to show the speed is either 36.0 mph or 44.0 mph.

To prove

Formula

$Percentage\ error = \frac{error\times 100}{Exact\ value}$

Where error = |Approx value - Exact value |

First case

As given

A speedometer has a percent error of 10%. The actual speed of the car is 40 mph.

Here

Percentage error = 10%

Exact value = 40 mph

error = - (Approx value - Exact value )

= - (Approx value - 40 )

= - Approx value + 40

Put in the formula

$10 = \frac{(-Approx\ value + 40)\times 100}{40}$

$400 = {(-Approx\ value + 40)\times 100}$

$\frac{400}{100} =-Approx\ value + 40$

$\4 =-Approx\ value + 40$

Thus

Approx value = 40 - 4

Approx value = 36 mph

Therefore Option (b) is correct .

Second Case

error = (Approx value - Exact value )

= (Approx value - 40 )

= Approx value - 40

Put in the formula

$10 = \frac{(Approx\ value - 40)\times 100}{40}$

$400 = {(Approx\ value - 40)\times 100}$

$\frac{400}{100} = Approx\ value - 40$

$\4 = Approx\ value - 40$

Thus

Approx value = 40 + 4

Approx value = 44 mph

Therefore Option (c) is correct .

4 0

3 years ago

54 is 60% of what number?

Genrish500 [490]

Let, the number = x

Then, x * 60% = 54

x * 0.60 = 54

x = 54 / 0.60

x = 90

In short, Your Answer would be: 90

Hope this helps!

6 0

4 years ago

Read 2 more answers