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3 years ago

Help me and am I doing this right

Mathematics

1 answer:

Nat2105 [25]3 years ago

5 0

Looks write but i think ur missing somthing

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A flagpole is 12.5 m tall. It casts a 17.5 m shadow. How tall is a nearby radio tower that casts a 61.25 m shadow? _____

tresset_1 [31]

Answer:

Step-by-step explanation:

7 0

3 years ago

A chocolate manufacturer sells a 320g ar of chocolate for 50p. The size of the bar is reduced by 20%, and the price to 42p.

Contact [7]

Answer:

less value

Step-by-step explanation:

To deterimine if value was improved or not, we need to compare the price reduction to the size reduction.

The reduction in price is ...

((new value)/(old value) -1) × 100%

= (42/50 -1) × 100% = -16%

The size reduction of 20% is more than the price reduction of 16%, so the chocolate bar is less value.

_____

Additional comment

Compared to the original value, the new price to chocolate ratio is ...

0.84/0.80 = 1.05

Effectively, the price was raised by 5%.

6 0

2 years ago

What is the difference? −15 − (−3)

klasskru [66]

The answer is -12 bc you take away the 3

3 0

1 year ago

Read 2 more answers

URGENT I NEED HELP RIGHT NOW 5 STAR + BRAINLY

nydimaria [60]

96 is the result 200 x .48

7 0

3 years ago

If cos x= sin(20 + x)° and 0° < x < 90°, what is the value of x

ZanzabumX [31]

If cos x= sin(20 + x)° and 0° < x < 90° then value of x is 35 degrees

Solution:

Given that:

$cos x= sin (20 + x)$

We know that,

$sin (a+b)=sin a \times cos b+cos a \times sin b$

$cos x= sin (20 + x) = sin 20 cos x + cos 20 sin x$

$cos x-sin20 \times cos x=cos 20 \times sin x$

Taking cos x as common,

$cos x(1-sin 20)=cos 20 \times sin x$

$\frac{(1-sin 20)}{(cos 20)}=\frac{sin x}{cos x }\\\\tan x = \frac{(1-sin 20)}{(cos 20)}$

By trignometric functions,

sin 20 = 0.34202

cos 20 = 0.939692

So,

$tan x = \frac{1 - 0.34202}{0.939692}\\\\tan x = 0.7002$

Therefore,

x = arc tan (0.7002)

x = 35 degrees

Therefore value of x is 35 degrees

<h3>Method 2:</h3>

cos x = sin (20 + x)

sin and cos are co - functions, which means that:

cos x = cos [90 - (20 + x)]

cos x = cos (90 - 20 - x)

cos x = cos (70 - x)

Therefore, x = 70 - x

x + x = 70

2x = 70

x = 35

Therefore value of x is 35 degrees

3 0

3 years ago