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3 years ago

-4C - 6 - 3 + 2c - 60 + 15

Mathematics

1 answer:

kenny6666 [7]3 years ago

7 0

Answer:

-2x -54 here is the answer

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The cosine law

romanna [79]

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

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

3 0

3 years ago

Skye needs 50 g of sugar to make 30 biscuits.

olga_2 [115]

Answer:600g

Step-by-step explanation: 50x3=150 150x4=600 since 30x4=120

5 0

3 years ago

Tara's car accelerated from 10 miles per hour to 70 miles per hour in 12 seconds.

Karo-lina-s [1.5K]

It would be: a = v₂-v₁ / t
a = (70-10) / 12
a = 60 / 12
a = 5 m/s²

So, option A is your final answer.

Hope this helps!

3 0

3 years ago

You paint four walls. Each wall is a rectangle with a length of 20 feet and a height of 10 feet. One gallon of paint covers abou

Sphinxa [80]

Answer:

Step-by-step explanation:

20 x 10= 200 ft

1 gallon is 330 ft

paint 4 walls

200 x 4

800 ft/ 330

You would need 2.434 gallons of paint.

6 0

3 years ago

The area for a trapezoid is given by the formula below, where a and b are the lengths of the two bases and h is the height of th

aivan3 [116]

Answer:

Step-by-step explanation:

Given

A = $\frac{h(a + b)}{2}$

Substitute the given values with h = a, then

16.5 = $\frac{a(a+8)}{2}$ ( multiply both sides by 2 )

33 = a(a + 8) ← distribute

33 = a² + 8a ( subtract 33 from both sides )

0 = a² + 8a - 33 ← in standard form

0 = (a + 11)(a - 3) ← in factored form

Equate each factor to zero and solve for a

a + 11 = 0 ⇒ a = - 11

a - 3 = 0 ⇒ a = 3

However, a > 0 thus a = 3

Hence the height is 3 feet

4 0

3 years ago