3 years ago

PLS HELP!! PLSSSS, ITS 8TH GRADE!!

Mathematics

1 answer:

ipn [44]3 years ago

4 0

Answer:

7. 2 6/7

8. -2 1/12

9. -12 4/5

10. 16/9

11. 53/15

12. -29/12

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10) A rhombus has a diagonal 8.6 mm long and an area of 81.7 mm. what is the perimeter?

BaLLatris [955]

Answer:

P=41.72

Step-by-step explanation:

S=ACxDB/2

81.7=8.6xDB/2

81.7=4.3xDB|:4.3

19(mm)=DB

DO=19/2=9.5

OC=8.6/2=4.3

(O is the center of the rhombus, where two diagonals meet)

a²+b²=c² (DO²+OC²=DC²)

9.5²+4.3²=c²

90.25+18,49=c²

√108,74=√c²

c≈10.43

P=4c

P=4x10.43

P=41.72

Hope it helps:)

6 0

2 years ago

Which equation can be used to find the measure of an angle that is supplementary to ∠EOF

sweet-ann [11.9K]

C because eof plus fob will end up being 180

4 0

4 years ago

-2(3y - 6) + 4(5y - 8) = 92

Whitepunk [10]

Answer:

y = 8

Step-by-step explanation:

$-2(3y - 6) + 4(5y - 8) = 92\\\\\mathrm{Expand\:}-2\left(3y-6\right)+4\left(5y-8\right):\quad 14y-20\\14y-20=92\\\\\mathrm{Add\:}20\mathrm{\:to\:both\:sides}\\14y-20+20=92+20\\\\Simplify\\14y=112\\\\\mathrm{Divide\:both\:sides\:by\:}14\\\frac{14y}{14}=\frac{112}{14}\\\\Simplify\\y= 8$