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3 years ago

Can anyone help me please

Mathematics

1 answer:

Flura [38]3 years ago

5 0

<h3>Answers:</h3>

d. -16
c. 64
e. 0
b. 16
f. 1
a. -1

<h3>Hope it helps</h3>

ray4918 here to help

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Prove that sin20 sin40 sin60 sin80=3/16

xeze [42]

Sin 20° · sin 40° · sin 80° = 1/2 ( cos 20° - cos 60° ) · sin 80° =
= 1/2 ( cos 20° sin 80° - cos 60° sin 80° ) =
= 1/2 ( (sin 100° + sin 60°)/2 - 1/2 sin 80° )= ( sin 100° = sin 80° )
= 1/2 · ( 1/2 sin 60° ) = 1/4 sin 60° = √3 / 8
sin 60° = √ 3/2
√ 3 / 2 · √ 3 / 8 = 3/16 ( correct )

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3 years ago

Solve for b1 from the formula: A=1/2h(b1+b2)

Andrews [41]

Answer:

$B1 = \frac{2A-(h*B2)}{h}$

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Step-by-step explanation:

FOIL

(1/2)h*B1+ (1/2)h*B2=A

subtract the B2 term

(1/2)h*B1 = A- (1/2)h*B2

multiply by 2

h*B1 = 2A - h*B2

divide by h

$B1 = \frac{2A-(h*B2)}{h}$

$B1=\frac{2A}{h} - B2$

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3 years ago

Please help me solve this problem ASAP

MArishka [77]

Use the pythagorean theorem formula: a^2 + b^2 = c^2
c is the longest side of a triangle.
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14^2 + 11^2 = c^2
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3 years ago

Fifteen more than half a number is 9

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4 years ago

A certain ferry moves up and down a river between Town A and B. It takes the ferry two hours to travel to Town A and only an hou

Y_Kistochka [10]

Answer:

The distance between two cities is <em>60 miles.</em>

Step-by-step explanation:

Time taken to travel from B to A = 2 hours

Time taken to travel from A to B = 1.5 hours

Current speed = 5 mph

Let the speed of ferry in still water = <em>u</em> mph

When the ferry moves with the current, it will taken lesser time (i.e. A to B) and when it moves against the current it will take more time (i.e. B to A).

Let the distance between the two cities A and B = D miles

While moving with the current, speed = $(u+5)\ mph$