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3 years ago

Help pls ?? anyone ?

Mathematics

1 answer:

Citrus2011 [14]3 years ago

6 0

Answer:

Theyre both going to be 27.

Step-by-step explanation:

2n+21=4n+15

-2n -2n

21=2n+15

-15 -15

$\frac{6}{2}$ = $\frac{2n}{2}$

3=n

2n+21

2(3)+21=27

4n+15

4(3)+15=27

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90% of runners who started a marathon completed it. Of those, 30% are men. If 270 men completed the marathon, then how many tota

il63 [147K]

Given- 90% of runner completed the marathon.

out of which 30% are man.

To proof - let the total number of runner be y.

the men completed the marathon be 30% of the 90%.

thus we have

30% of 90% of y = 270

$\frac{30}{100}$ × $\frac{90}{100}$ ×y = 270

now solving the above equation

we get

$\\y=\frac{270\times 100\times 100}{90\times 30}$

Thus solving the equation

y = 1000

Thus the total runners of men who completed marathon be 1000.

Hence proved

7 0

3 years ago

sierra is supposed to practice flute for a total of 5 1/4 hours every week. this week, she practiced 15 minutes on sunday, 1 hou

lukranit [14]

5×60 minutes =300 minutes
300+15 minutes or 1/4hr
315 minutes each week

15+60+30+45+15+45=210 minutes

300-210= 90 minutes

6 0

4 years ago

What is the area of △JKL in square units? KJL is a triangle. The angle J is 94 degree and the angle L is 26 degree. Side JK is 2

Tamiku [17]

Answer:

426.07 square units

Step-by-step explanation:

Recall that for a triangle whose angles are A,B,C with corresponding sides a, b, c, the area G of the triangle may be computed as

G = 1/2 ab Sin C

G = 1/2 bc Sin A

G = 1/2 ac Sin B

Going by this, recall that the sum of angles in a triangle is 180 hence

94 + 26 + K = 180

120 + K = 180

Subtract 120 from both sides

K = 180 - 120

K = 60 degrees

Given that JK = 24 and JL = 41

G = 1/2 * 24 * 41 Sin 60

= 426.07 square units

8 0

3 years ago

Y is equal to the additive inverse of 4x. Use this information to find the value of the expression 17x + 3y in terms of x.

nevsk [136]

Answer:

Step-by-step explanation:

The additive inverse of a function is that value added that will sum it up to zero

If y is the additive inverse of 4x, then y = -4x

Given the expression 17x+3y

Substitute y = -4x into the expression to have;

17x + 3(-4x)

17x -12x

Hence the value of the expression in terms of x is 5x

5 0

3 years ago

Given: ∠A and ∠B are complementary angles.

Eddi Din [679]

Answer:

- For the statement $-3x=24$ , the reason is: <em>Subtraction property of Equality</em>

- For the statement $x=-8$ , the reason is: <em>Division property of Equality.</em>

- For the statement $m\angle B=-6(-8)-39$ , the reason is: <em>Substitution property of Equality.</em>

Step-by-step explanation:

The missing pictures are attached.

We must remember that:

- The Subtraction property of Equality states that:

$If\ a=b,\ then\ a+c=b+c$

- The Division property of Equality states that:

$If\ a=b,\ then\ \frac{a}{c}=\frac{b}{c}$

- The Substitution property of Equality states that:

$If\ a=b,\ then\ b\ can\ replace\ a$

Knowing this properties we can identify the missing reasons that correctly complete the proof.

- For the statement $-3x=24$ , the reason is:

Subtraction property of Equality

(Because it is obtained by subtracting 66 from both sides of $-3x+66=90$ )

- For the statement $x=-8$ , the reason is:

Division property of Equality

(Because it is obtained by dividing both sides of $-3x=24$ by -3)

- For the statement $m\angle B=-6(-8)-39$ , the reason is:

Substitution property of Equality

(Because it is obtained by substituting the value of "x" into $m\angle B=-6x-39$ )

7 0

4 years ago