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3 years ago

Which expression represent the approximate length of BC HEEEEELLLLPPP!!!

Mathematics

1 answer:

Bumek [7]3 years ago

5 0

Answer:

Step-by-step explanation:

Using the Sine rule in Δ ABC

$\frac{sinA}{BC}$ = $\frac{sin38}{AB}$ , substitute values

$\frac{sin66}{BC}$ = $\frac{sin38}{3}$ ( cross- multiply )

BC sin38° = 3 sin66° ( divide both sides by sin38° )

BC = $\frac{3sin66}{sin38}$ → A

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Define the value of the expression 3^2 x 3^{-5}

Tanya [424]

Answer:

Between 0 and 1

Step-by-step explanation:

The given expresion is

${3}^{2} \times {3}^{ - 5}$

Recall that:

${a}^{m} \times {a}^{n} = {a}^{m + n}$

We apply this property of exponents to get;

${3}^{2} \times {3}^{ - 5} = {3}^{2 + - 5} = {3}^{ - 3}$

We rewrite to obtain a positive index as:

${3}^{2} \times {3}^{ - 5} = \frac{1}{ {3}^{3} } = \frac{1}{27}$

Therefore the value of the expression is between 0 and 1.

8 0

3 years ago

What is the perimeter of this pentagon?

exis [7]

Answer:

the perimeter of the Pentagon is 2.75cm

Step-by-step explanation:

add each side together in decimal form

8 0

3 years ago

What sequence would 20, 10, 5 be?

love history [14]

Answer:

it going down dividing by 2

Step-by-step explanation:

4 0

3 years ago

Eunice wanted to save up for a mountain bike that costs £250. She baby-sits each week for 6 hours for £2.75 an hour, and does a

choli [55]

Answer:

Approximately 2 weeks

Step-by-step explanation:

Given data

Cost of bike= £250

Assuming she works for 6 days

1.Babysitting

6*2.75=£16.5 per day

for 6 days

=16.5*6

=£99

2. Saturday Job

=£27.50

Total earnings for the week

=£27.50+£99

=£126.5 weekly

Hence it will take her

=250/126.5

=1.97 week

Approximately 2 weeks to save up the amount

3 0

3 years ago

A triangle has vertices T(-2,4), E(6,2), and D(1,-1). Is ATED a right triangle?

inessss [21]

Answer:

B. Yes, because ED is perpendicular to DT which makes a right angle.

Step-by-step explanation:

Plot the given points and connect in pairs to get a triangle.

Visually we can say it is a right triangle as legs TD and ED seem perpendicular.

Let's confirm this by finding the slopes.

Slope of TD:

m = (-1 - 4)/(1 -(-2)) = -5/3

Slope of ED:

(-1 - 2)/ (1 - 6) = -3/-5 = 3/5

Product of the slopes is:

-5/3*3/5 = -1

This confirms DT⊥ED

Correct choice is B

6 0

3 years ago