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xeze [42]
3 years ago
5

If DE=3x+7, EF=2x-3 and DF=7x-9, find DF

Mathematics
1 answer:
Lunna [17]3 years ago
5 0

Answer:

So -63 isn't the right answer. It is either 6.5 or 13/2 based on how your teacher wants the answer.

Step-by-step explanation:

I did the work to show you how i got there. It is definitely not -63. I hope this helps!

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How can you identify a linear relationships in tables,graphs, and written form?
Arturiano [62]
<span>y = 2x + 15
x = 6 + 3y
<span>y/2 = 3 − x

these are all linear anything with Y=mx+B</span></span>
4 0
3 years ago
Read 2 more answers
What are the solutions of the equation (x – 3)2 + 2(x – 3) – 8 = 0? Use u substitution to solve.
Flura [38]

Answer:

<u>u=5</u>

Step-by-step explanation:

(u-3)2+2(u-3)-8=0

2u-6+2u-6-8=0

4u-20=0

4u=20

u=5

8 0
3 years ago
What percent of 300 is 51
Gnoma [55]

Answer:

17

Step-by-step explanation:

300:51*100 =

(300*100):51 =

30000:51 = 588.24

Now we have: 300 is what percent of 51 = 588.24

Question: 300 is what percent of 51?

Percentage solution with steps:

Step 1: We make the assumption that 51 is 100% since it is our output value.

Step 2: We next represent the value we seek with $x$x​.

Step 3: From step 1, it follows that $100\%=51$100%=51​.

Step 4: In the same vein, $x\%=300$x%=300​.

Step 5: This gives us a pair of simple equations:

$100\%=51(1)$100%=51(1)​.

$x\%=300(2)$x%=300(2)​.

Step 6: By simply dividing equation 1 by equation 2 and taking note of the fact that both the LHS

(left hand side) of both equations have the same unit (%); we have

$\frac{100\%}{x\%}=\frac{51}{300}$

100%

x%​=

51

300​​

Step 7: Taking the inverse (or reciprocal) of both sides yields

$\frac{x\%}{100\%}=\frac{300}{51}$

x%

100%​=

300

51​​

$\Rightarrow x=588.24\%$⇒x=588.24%​

Therefore, 17% of 300 is 51

3 0
4 years ago
Read 2 more answers
Consider a political discussion group consisting of 5 ​Democrats, 8 ​Republicans, and 5 Independents. Suppose that two group mem
Levart [38]

Answer:

4/9 and 5/18

Step-by-step explanation:

Total: 5+8+5=18

the probability of selecting a Republican is 8/18=4/9

the probability of selecting a Democrat is 5/18

6 0
4 years ago
Rectangle QRST has vertices located at Q(-9, -3), R(-1,-1), S(0,-5) and T(-8, -7). What is the length of side ST?
yaroslaw [1]

Answer:

\huge\boxed{\sf |ST| = 8.2 \ units}

Step-by-step explanation:

S = (x1,y1) = (0,-5)

T = (x2,y2) = (-8,-7)

<u>Using distance formula to find the length of ST</u>.

|ST|= \sqrt{(x_2-x_1)^2+(y_2-y_1)^2} \\\\|ST| = \sqrt{(-8-0)^2+(-7-(-5))^2} \\\\|ST| = \sqrt{(-8)^2+(-7+5)^2} \\\\|ST| = \sqrt{64+(2)^2}\\\\|ST| = \sqrt{64+4} \\\\|ST| = \sqrt{68} \\\\|ST| = 8.2 \ units\\\\\rule[225]{225}{2}

8 0
3 years ago
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