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3 years ago

3) Kelsey ran 1.9 miles on Tuesday. On Saturday she ran twice as much. How

Mathematics

2 answers:

xxTIMURxx [149]3 years ago

6 0

Answer:

5.7 miles

Step-by-step explanation:

1.9*2 = 3.8

She ran 3.8 miles on the second day

1.9 + 3.8 = 5.7

She ran 5.7 miles in total

sweet-ann [11.9K]3 years ago

5 0

Answer:

5.7

Step-by-step explanation:

1.9 x 2 = 3.8 + 1.9 = 5.7

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The cosine law

romanna [79]

$\bf \textit{Law of sines}
\\ \quad \\
\cfrac{sin(\measuredangle A)}{a}=\cfrac{sin(\measuredangle B)}{b}=\cfrac{sin(\measuredangle C)}{c}\\\\
-------------------------------\\\\$

$\bf \cfrac{sin(88^o)}{39.9}=\cfrac{sin(A)}{31}\implies \cfrac{31\cdot sin(88^o)}{39.9}=sin(A)
\\\\\\
sin^{-1}\left[ \cfrac{31\cdot sin(88^o)}{39.9} \right]=sin^{-1}\left[ sin(A) \right]
\\\\\\
sin^{-1}\left[ \cfrac{31\cdot sin(88^o)}{39.9} \right]=\measuredangle A
\\\\\\
50.93841^o\approx \measuredangle A\qquad thus\qquad \measuredangle C\approx 41.0619^o$

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3 years ago

two sides of a triangle measures 20 centimeters and 30 centimeters which of the following could be the measure of the third side

brilliants [131]

To find the third side of a triangle (there are two answers you could get), you need to use the Pythagorean formula: a^2+b^2=c^2. First answer, 20^2+30^2=c^2. Solve for c. c=36.06. The second answer, 20^2+b^2=30^2. Solve for b. b=26.36.

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2 years ago

Solve. 489.209 + 43.9

lidiya [134]

Answer:

533.109

Step-by-step explanation:

Just add all the numbers

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3 years ago

Find the area of the irregularly-shaped hexagon below

Ber [7]

let each box length be 1

for white triangle

area = ½bh

=½(4)(2)

for orange triangle

area=½(2)(3)

for blue marked boxes

each of the box

area=l²

=(1)²

there are 16 boxes

so the total area will be 16

total area of the hexagon = 4+3+16

=23 square units

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3 years ago

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The decibel level of sound in a quiet office is 10−6watts/m2.

Liono4ka [1.6K]

I don’t understand your question can you explain it more

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3 years ago