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OLEGan [10]
3 years ago
7

Three times the difference between 4 times h and five is 45

Mathematics
1 answer:
Anestetic [448]3 years ago
5 0

3(4h-5) =45

12h-15=45

+15 +15

12h = 60

÷12 ÷12

h = 5

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3 years ago
Help me, please with my homework
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Answer:


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7 0
3 years ago
Read 2 more answers
Rounding or compatible 328+127=
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Answer:

455

Step-by-step explanation:

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                       <u>+ 127</u>

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7 0
3 years ago
While exercising, a person's recommended target heart rate is a function of age. The recommended number of beats per minute, y ,
inysia [295]

Answer:

174.25

Step-by-step explanation:

To solve this equation I will assume you are 15 as this is a High School level problem.

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4 0
3 years ago
What is the half-angle of tangent 22.5 (degrees)?
Sergio039 [100]

Find tan (22.5)

Answer: #-1 + sqrt2#

Explanation:

Call tan (22.5) = tan t --> tan 2t = tan 45 = 1

Use trig identity: # tan 2t = (2tan t)/(1 - tan^2 t)# (1)

#tan 2t = 1 = (2tan t)/(1 - tan^2 t)# -->
--> #tan^2 t + 2(tan t) - 1 = 0#
Solve this quadratic equation for tan t.

#D = d^2 = b^2 - 4ac = 4 + 4 = 8# --> #d = +- 2sqrt2#
There are 2 real roots:
tan t = -b/2a +- d/2a = -2/1 + 2sqrt2/2 = - 1 +- sqrt2
Answer:
#tan t = tan (22.5) = - 1 +- sqrt2#
Since tan 22.5 is positive, then take the positive answer:
tan (22.5) = - 1 + sqrt2


6 0
3 years ago
Read 2 more answers
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