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Tamiku [17]
3 years ago
7

Simplify 5t+ (-3) - ((7t + 5) -( 8-39).A -4 B 4C -10tD 10t​

Mathematics
1 answer:
brilliants [131]3 years ago
3 0

I guess it's A -4 sorry if it's wrong answer

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3x+10y=13<br> 4(-2y+x)-9x=13
mart [117]

Answer:

x=-9

y=4

Step-by-step explanation:

3x+10y=13 ← Equation 1

4(-2y+x)-9x=13\\

By simplifying the above equation we get,

-8y+=4x-9x=13 (Simplifying the brackets)

-8y-5x=13 (By subtracting -9x from +4x) ← Equation 2

Multiply Equation 1 by 5 and Equation 2 by 3 and add them together.

Equation 1 multiplied by 5 will give,

15x+50y=65

Equation 2 multiplied by 3 will give,

-24y-15x=39

Add those together,

15x+50y-24y-15x=65+39

26y=104 (After simplifying x values)

Therefor y=4

By substituting y=4 to Equation 1 we get,

3x+10*4=133x+40=13\\3x=-27\\x=-9

Therefor we can say,

x=-9

y=4

8 0
3 years ago
the ratio of number of girls and boys in a class of 30 students is 7:8. if 5 new boys students admit in the class. what will be
Stells [14]
<h3>Given:</h3>

The ratio of number of girls and boys in a class of 30 students is 7:8

<h3>To Find:</h3>

The ratio of number of girls and boys if 5 new boys admit in the class.

<h3>Assumption:</h3>

Let the number of students be x.

<h3>Solution:</h3>

According to the question,

7x + 8x = 30

or, 15x = 30

or, x = \large {\tt {\frac{30}{15}}}

or, x = 2

7x = 7(2) = 14

8x = 8(2) = 16

There were 14 boys and 16 girls in the school.

After admitting 5 new boys, we get

14 + 5 = <u>19</u>

The ratio of number of girls and boys now is 16:19.

<h2>Answer:</h2>

<u>1</u><u>6</u><u>:</u><u>1</u><u>9</u>

5 0
3 years ago
-8h+z/7<br> Use z=21 and h=4
Klio2033 [76]

Answer:

Hope this helps

Step-by-step explanation:

7 0
3 years ago
Erika spends about 4 hours each week practicing her violin. How much time would Erika spend practicing her violin for an entire
Artemon [7]

Answer:

There are 52 weeks in a year. So the problem is 4 x 52

Step-by-step explanation:

5 0
3 years ago
The sum of a number and -20 is 40.What is the number?
Reika [66]

sum means addition

 so x +-20 = 40

x = 40 +20 = 60

x=60


3 0
3 years ago
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