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solmaris [256]
3 years ago
14

What is the variable in this expression? 5x^2 + x+7

Mathematics
1 answer:
Zinaida [17]3 years ago
6 0

Answer:

its x

Step-by-step explanation:

hope it helps unlike that other person

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If (x+1)(x-3)=12, then which of the following statements is true?
Semmy [17]

Answer:

C. x-5=0 or x+3=0

Step-by-step explanation:

Given,

(x+1)(x-3)=12

x^2+1x-3x-3=12             ( By multiplication )

x^2-2x-3=12                  ( By operating like terms )

x^2-2x-3-12=0               ( Subtracting 12 on both sides )

x^2-2x-15=0                

x^2-5x+3x-15=0            ( By middle term splitting )

x(x-5)+3(x-5)=0

(x+3)(x-5)=0

By the zero product property,

(x+3)=0\text{ or }(x-5) =0

Hence, option C is correct.

6 0
3 years ago
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The school chess team must raise mora than $300 to attend a regional chess competition. Complete the inequality below to represe
Irina18 [472]

Answer:

a > $300

Step-by-step explanation:

Note that

> means greater than

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≤ less than or equal to  

for example : 2 < 3 means 2 is less than 3

3 >2 means 3 is greater than 2

the school must raise greater than $300 so the sign to be used is >

let the amount = a

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3 years ago
What is the area, in square units, of triangle STU?
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Answer:

4 units squared

Step-by-step explanation:

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The area of the two wedge-shaped triangles on the outside of the larger triangle is 3 units squared. The final triangle area is 2 units squared. Thus 9 - 5 = 4 units squared.

4 0
2 years ago
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