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3 years ago

What does -3+7y=5x+2y Equal (I’m bad at math)

Mathematics

1 answer:

bogdanovich [222]3 years ago

5 0

Answer: 22 /5

-3+7y=5x+2y

Step-by-step explanation:

Subtract 2y from each side

-3+7y-2y=5x+2y-2y

-3 +5y = 5x

Add 5 to each side

5y = 5x+3

Divide each side by 5

y = 5x/5 +3/5

y = x +3/5

Let x = -5

y = -5 + 3/5

y = -25/5 +3/5

y = -22/5

Step-by-step explanation:

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Rita and Tina each make $11 an hour working as cashiers at a supermarket. Last week, Rita worked r hours while Tina worked t hou

Rus_ich [418]

Rita's pay plus the overtime hrs, plus Tina's pay equals the total weekly wages(w)
[(11r) + 32] + 11t = w
That's one of the ways
Also, Rita's pay plus Tina's pay = weekly wages plus Rita's overtime hours pay
11r + 11t = w +32

Technically you just have to put the variables in the right places for it to make sense for the word problem
You can do the last example Good Luck!

Hope this helps :)

3 0

3 years ago

Read 2 more answers

1. The national mean (μ) IQ score from an IQ test is 100 with a standard deviation (s) of 15. The dean of a college wants to kno

Nat2105 [25]

Answer:

We conclude that the mean IQ of her students is different from the national average.

Step-by-step explanation:

We are given that the national mean (μ) IQ score from an IQ test is 100 with a standard deviation (s) of 15.

The dean of a college want to test whether the mean IQ of her students is different from the national average. For this, she administers IQ tests to her 144 students and calculates a mean score of 113

Let, Null Hypothesis, $H_0$ : $\mu$ = 100 {means that the mean IQ of her students is same as of national average}

Alternate Hypothesis, $H_1$ : $\mu\neq$ 100 {means that the mean IQ of her students is different from the national average}

(a) The test statistics that will be used here is One sample z-test statistics;

T.S. = $\frac{Xbar-\mu}{\frac{s}{\sqrt{n} } }$ ~ N(0,1)

where, Xbar = sample mean score = 113

s = population standard deviation = 15

n = sample of students = 144

So, test statistics = $\frac{113-100}{\frac{15}{\sqrt{144} } }$

= 10.4

Now, at 0.05 significance level, the z table gives critical value of 1.96. Since our test statistics is more than the critical value of z which means our test statistics will fall in the rejection region and we have sufficient evidence to reject our null hypothesis.

Therefore, we conclude that the mean IQ of her students is different from the national average.

3 0

4 years ago

Identify the value of x that makes each pair of ratios equivalent. X to 50 and 16 to 25

olasank [31]

✧･ﾟ: *✧･ﾟ:* *:･ﾟ✧*:･ﾟ✧

Hello!

✧･ﾟ: *✧･ﾟ:* *:･ﾟ✧*:･ﾟ✧

❖ x = 32

x:50

16:25

The pattern here is divide by 2 (or if doing the opposite way, multiply by 2.)

16 x 2 = 32, so x = 32

~ ʜᴏᴘᴇ ᴛʜɪꜱ ʜᴇʟᴘꜱ! :) ♡

~ ᴄʟᴏᴜᴛᴀɴꜱᴡᴇʀꜱ

6 0

3 years ago

How to add fractions? with unlike denominators

stellarik [79]

Answer:

The recipe calls for 19/12 or 1 7/9 cups.

Step-by-step:

In order to get this answer, we have to add all three fractions together. First, we have to find the LCM (Least Common Multiple) between the three denominators:

2: 2, 4, 6, 8, 10, 12

3: 3,6,9,12

4: 4,8,12

The LCM between these three denominators is 12.

4x3=12

2x6=12

3x4=12

You now multiply the numerator by the same number you multiplied by for the denominator in order to get 12:

3/4 becomes 9/12

1/2 becomes 6/12

1/3 becomes 4/12

We now add all the fractions together:

9/12+6/12+4/12= 19/12

We got 19/12 but the answer is an improper fraction so we turn it into a mixed number:

12x1=12 (7 remaining)

This is written as 1 7/12.

Hope this helps! :)

<h3>CloutAnswers</h3>

3 0

4 years ago

May I have help on This question please I’ll award you brainliest

mamaluj [8]

The correct answer is:

$2.3*12=27.6\\27.6>27.1$

Further explanation:

Inches is a smaller unit of measurement while inches is a larger unit.

And we know that

1 feet=12 inches

In order to compare 2.3 feet to 27.1 inches

We will convert 2.3 feet to inches

So,

$2.3*12=27.6\ inches$

As 27.6 is greater than 27.1 so,

$27.6>27.1$

Hence,

The correct answer is:

$2.3*12=27.6\\27.6>27.1$

Keywords: Conversions, Feet

Learn more about conversions at:

#LearnwithBrainly

3 0

4 years ago