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4 years ago

I need help with number 30......……

Mathematics

1 answer:

goblinko [34]4 years ago

4 0

65+56=121, 180-121=59, 59/8=7.375 , so the answer is A

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Solve the given system of equations utilizing either the substitution or addition method.

Nataly [62]

Answer:

Value of x=4 and y=-13/3

Step-by-step explanation:

We need to solve the systems of equations

$5x+3y=7 \ and \ \frac{3}{2}x-\frac{3}{4}y =9\frac{1}{4}$

Solving using substitution method:

Let:

$5x+3y=7---eq(1) \\ \frac{3}{2}x-\frac{3}{4}y =9\frac{1}{4}---eq(2)$

Find value of x from eq(1) and put in eq(2)

$5x+3y=7\\5x=7-3y\\x=\frac{7-3y}{5}$

Put value of x in eq(2)

$\frac{3}{2}(\frac{7-3y}{5}) -\frac{3}{4}y =\frac{37}{4}\\\frac{21-9y}{10} -\frac{3}{4}y =\frac{37}{4}\\Taking \ LCM\\\frac{21*2-9y*2-3y*5}{20} =\frac{37}{4}\\\frac{42-18y-15y}{20} =\frac{37}{4}\\42-33y=\frac{37}{4}*20\\42-33y=185\\-33y=185-42\\-33y=143\\y=\frac{143}{-33}\\y=-\frac{13}{3}$

Now, finding value of x by putting value of y in eq(1)

$x=\frac{7-3y}{5}\\x= \frac{7-3(-\frac{13}{3}) }{5}\\x=\frac{7+13}{5}\\x=\frac{20}{5}\\x=4$

So, Value of x=4 and y=-13/3

4 0

3 years ago

These dot plots show the heights (in feet) from a sample of two different

Nikolay [14]

Answer:C

Step-by-step explanation:They have a greater IQR because there were some very short elephants (low outliers)

7 0

4 years ago

What is the lateral area of the rectangular prism with a base length of 14 m, a base width of 9 m, and a height of 6 m?

katen-ka-za [31]

Thank you for posting your question here at brainly. Feel free to ask more questions.

The best and most correct answer among the choices provided by the question is B.276 m2
.
 
Hope my answer would be a great help for you.

7 0

3 years ago

Read 2 more answers

What is 3 x -2? Please answer quickly!!!

Ket [755]

Answer: -6

Step-by-step explanation:

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3 years ago

Constance ran 620 meters around 4 sides of a square field. How many meters long was each side of the field?

kumpel [21]

155 meters is the answer. You have to divide 620 by 4.

5 0

3 years ago