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swat32
3 years ago
12

HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAP

Mathematics
2 answers:
deff fn [24]3 years ago
7 0

Answer:

A

Step-by-step explanation:

try D first (;

dalvyx [7]3 years ago
5 0

Answer:

The answer would be: D. (1,2) and (2,-1)

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A textbook store sold a combined total of 438 biology and psychology textbooks in a week. The number of psychology textbooks sol
Liono4ka [1.6K]
<h2>Answer:</h2>

Number of biology textbooks sold: 257 textbooks

Number of psychology textbooks sold:​ 181 textbooks

<h2>Explanations:</h2>

Let the total number of biology textbook sold be "a"

Let the total number of psychology textbook sold be "b"

If a textbook store sold a combined total of 438 biology and psychology textbooks in a week, then:

a + b = 438 ................... 1

If the number of psychology textbooks sold was 76 less than the number of biology textbooks sold, then;

b = a - 76 ...................... 2

Substitute equation 2 into 1

a + (a-76) = 438

a + a - 76 = 438

2a = 438 + 76

2a = 514

a = 514/2

a = 257 biology textbooks

From equation 2;

b = a - 76

b = 257 - 76

b = 181 psychology textbooks

Number of biology textbooks sold: 257 textbooks

Number of psychology textbooks sold:​ 181 textbooks

7 0
1 year ago
You spend 60 on clothes and buy 3 dvd movies. your friend spends nothing on clothes and buys 8 dvd movies. you both spend the sa
garik1379 [7]
Each dvd cost $7.50 how? Your friends buy 8 dvd's and in total is 60, you want to divide 60 from 8 and find that it's 7.50 and then multiply 8 to 7.50 and it should be 60. Hope this helps!!

5 0
3 years ago
How many solutions does the system below have?<br> y=1/2x+1<br> 2y - x = 2
kvasek [131]

Answer:

infinitely many

Step-by-step explanation:

Rewrite these equations as

y = (1/2)x + 1

2y = x + 2

and then solve the second for y:  y = (1/2)x + 1.  Note that these end results are identical.  The two lines coincide; that is, one lies right on top of the other.  Thus, there  are infinitely many solutions.

3 0
3 years ago
Solve the following:<br> a) 4x-3 = 2x + 7<br><br> b)<br> 2x+6=7x14
Igoryamba

\huge \qquad \qquad \sf \underline{Answer}

\textbf {Let's Solve :}

<h3>Question 1 :</h3>

  • \textsf{4x - 3 = 2x +7}

  • \textsf{4x -2x = 3 +7}

  • \textsf{2x = 10}

  • \textsf{x=5}

<h3>Question 2 :</h3>

  • \sf{2x + 6 = 7 \times 14}

  • \sf{2x + 6 = 98}

  • \sf{2x  = 98-6}

  • \sf{2x = 92}

  • \sf{x=46}

6 0
2 years ago
Defining congruent triangles cd​
Evgen [1.6K]

Answer:

When two triangles are congruent they will have exactly the same three sides and exactly the same three angles. The equal sides and angles may not be in the same position (if there is a turn or a flip), but they are there.

Step-by-step explanation:

When two triangles are congruent they will have exactly the same three sides and exactly the same three angles. The equal sides and angles may not be in the same position (if there is a turn or a flip), but they are there.

8 0
3 years ago
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