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3 years ago

Please help me idk this

Mathematics

1 answer:

GarryVolchara [31]3 years ago

6 0

Answer:

Step-by-step explanation:

$A=\dfrac{bh}{2}\\\\A=117\ cm^2\\b=13\ cm$

Substitute:

$117=\dfrac{13h}{2}$ multiply both sides by 2

$234=13h$ divide both sides by 13

$18=h\to h=18\ cm$

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in the figure below trianglePQM and triangleQRP are right triangles. the measure of lineQM is 6 and the measure of lineQP is 8.

Kipish [7]

Answer:

Option 4 is correct. The length of PR is 6.4 units.

Step-by-step explanation:

From the given figure it is noticed that the triangle PQR and triangle MQR.

Let the length of PR be x.

Pythagoras formula

$hypotenuse^2=base^2+perpendicular^2$

Use pythagoras formula for triangle PQM.

$PM^2=QM^2+PQ^2$

$PM^2=(6)^2+(8)^2$

$PM^2=36+64$

$PM^2=100$

$PM=10$

The value of PM is 10. The length of PR is x, so the length of MR is (10-x).

Use pythagoras formula for triangle PQR.

$PQ^2=QR^2+PR^2$

$(8)^2=QR^2+x^2$

$64-x^2=QR^2$ .....(1)

Use pythagoras formula for triangle MQR.

$MQ^2=QR^2+MR^2$

$(6)^2=QR^2+(10-x)^2$

$36=QR^2+x^2-20x+100$

$36-x^2+20x-100=QR^2$ .... (2)

From equation (1) and (2) we get

$36-x^2+20x-100=64-x^2$

$20x-64=64$

$20x=128$

$x=6.4$

Therefore length of PR is 6.4 units and option 4 is correct.

3 0

3 years ago

There are exactly three colors of socks in lamont's drawer: red, blue, and green. the current ratio of red to blue to green sock

Harrizon [31]

If the current ratio of red to blue to green socks is 2:3:7, then there are exactly 2x red socks, 3x blue socks and 7x green socks.

1. If amount of red socks are increased by n new socks, then there are exactly 2x+n red socks, 3x blue socks and 7x green socks and (2x+n):3x:7x=8:9:21. This means that 2x+n=8y, 3x=9y, 7x=21y. You have that x=3y and 6y+n=8y, n=2y.

2. If amount of blue socks are increased by n+2 new socks, then there are exactly 2x red socks, 3x+n+2 blue socks and 7x green socks and 2x:(3x+n+2):7x=2:4:7. This means that 2x=2t, 3x+n+2=4t, 7x=7t. Now you have that x=t and 3t+n+2=4t, n=t-2.

3. Solve x=3y, n=2y, x=t, n=t-2. You obtain that t=3y, t-2=2y. Then 3y-2=2y and y=2. Hence, x=6=t, n=6-2=4.

Answer: n=4

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3 years ago

Find the radius of a sphere with a volume of 4.5π cubic centimeters.

garik1379 [7]

R≈1.02
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3 years ago

Answers? i will mark brainliest if all correct

Marat540 [252]

All yuh have to do is double click the boxes and the correct number will pop up.

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4 years ago