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3 years ago

3x-15+10m-2x ; x=5 and m=7 evaluate the expression for the given value of the variable.

Mathematics

1 answer:

lianna [129]3 years ago

3 0

3(5)-15+10(7)-2(5)
15-15+70-10
=60
The answer is 60

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RideAnS [48]

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3 years ago

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spayn [35]

Answer:

a) m∠3=113°

b) x=8 (but check below)

Step-by-step explanation:

a) we know m∠1=m∠5

6x-5=5x+7

x=12

we also know m∠1+m∠3=180°

plug x into the formula for m∠1

m∠1=67

m∠1+m∠3=180°

67+m∠3=180°

m∠3=113°

b) Again, we know since those lines are parallel that m∠4=m∠8

x²-4x=32

x²-4x-32=0

(x-8)(x+4)=0

x=8 or x=-4

i think (not 100% sure about this part lol) but x cannot be negative so it's 8

again i'm not sure but it is either 8 or 8,-4.

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3 years ago

Solve the proportion below. 7/x=19

alexgriva [62]

Answer:

The value of x is approximately 0.3684.

Step-by-step explanation:

Given:

$\frac{7}x}=19$

We need to solve the proportion.

Solution:

Now we can see that;

In given equation one number is fraction and other number is whole number.

Now To make whole number into fraction we will divide by 1.

hence the whole number will be equal to;

$19=\frac{19}{1}$

Now the new equation will be;

$\frac{7}{x}=\frac{19}{1}$

Now by cross multiplication we get;

$7\times1=19\times x\\\\7=19x$

Now dividing both side by 19 we get;

$\frac{7}{19}=\frac{19x}{19}\\\\x\approx0.3684$

Hence the value of x is approximately 0.3684.

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4 years ago

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4 years ago

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babymother [125]

Answer:

first- B

second- correct

third- correct

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4 years ago