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3 years ago

The function p(d)=5⋅4d−1 represents the number of people who receive a certain e-mail on day d of an e-mail experiment.

Mathematics

2 answers:

spin [16.1K]3 years ago

8 0

The answer is A). Five people received the email on the first day on the experiment.

lara31 [8.8K]3 years ago

8 0

Answer:

Five people received the e-mail on the first day of the experiment.

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When you have a triangle and 2 of 3 angles are given the degrees and the last one is unknown, you subtract the two given degrees

storchak [24]

No, that's not right. Sadly, the answer you entered on the
attached drawing is incorrect. It's slightly more complicated
than that ... only slightly.

First, think about this for a second: What if the two GIVEN angles
on the drawing had the same number of degrees ? Then by the
method you've been using, you would subtract them from each
other, and that would give you zero. So you would say that the
last angle is zero degrees ? Can you see that this doesn't really
work ?

Here's how it's really done:

It all rests on a rule about triangles. This is ALWAYS true, and
you should memorize it:

   When you add up the degrees of all three angles
   inside a triangle, the sum is ALWAYS 180 degrees.

So now, when you're given two of the angles, you know that
the unknown one must be exactly enough to bring the sum of
ALL of them up to 180 degrees.

Work it like this:

-- Take the two given angles.
-- ADD them.
-- Subtract their SUM from 180.
   Now you have the third angle.

In the drawing you attached:

-- The given angles are 39 and 102 .
-- Add them: 39 + 102 = 141
-- Subtract the sum from 180: 180 - 141 = 39 .
   The unknown angle is 39 degrees.

But that's the same as one of the given angles ! ? :-( ? :-(

That's OK. It's perfectly fine for two of the angles, or sometimes
even all three, to be the same size. They just have to all add up
to 180 degrees, and everything is fine.

4 0

3 years ago

Read 2 more answers

Use a sales tax rate of 7%.Estimate the total cost for each item.a bicycle that costs $129

svet-max [94.6K]

Answer:

$138.03

Step-by-step explanation:

1.07*129 =138.03 represents an increase of 7%

6 0

3 years ago

Read 2 more answers

Which graph represents y=^3{x

dexar [7]

I need to see a photo of the graph to choose the correct answer

5 0

3 years ago

The function f(x) = 2x + 210 represents the number of calories burned when exercising, where x is the number of hours spent exer

Alex787 [66]

This means 339 calories burned while combining diet with 1 hour of exercise

Step-by-step explanation:

Given the functions as:

f(x)=2x+210

g(x)=2x+125 then

(f+g)(x) = 2x+210 +2x+125 = 4x +335

(f+g)(1) = 4(1)+335

=339

This means 339 calories burned while combining diet with 1 hour of exercise

Learn More

Functions :brainly.com/question/3122826

Keywords : function, calories,exercising, deficit

#LearnwithBrainly

3 0

3 years ago

Read 2 more answers

Which explicit formula generates the infinite sequence 2, 9, 28, 65, 126, ...?

Dimas [21]

1. The terms of a sequence are denoted by $u_{1} , u_{2}, u_{3}, u_{4}, u_{5},...$

2.
$u_{1} = 2 = 2*1

 u_{2} = 9 = 3*3
 
u_{3} = 28 = 4*7

u_{4} = 65 = 5*13

u_{5} = 126 = 6*21
$

3. so it is clear that the first columns add each time by one, and the second column add by 2, then by 4, by 6, by 8 and so on.

4. consider only the second column and how we get the terms, which we will call $t_{1} , t_{2}, t_{3}, t_{4}, t_{5},...$ :

$t_{1}=1

t_{2}=1+2

t_{3}=1+2+4=1+2+2*2

t_{4}=1+2+4+6=1+2+2*2+2*3=1+2(1+2+3)$

$t_{5}=1+2+2*2+2*3+2*4=1+2(1+2+3+4)$

5.
So

$u_{n}=(n+1)(1+2{1+2+3+....(n-1)})
 
 =(n+1)(1+2 [(n-1)n/2])

 = (n+1)(1+(n-1)n)
 
 =(n+1)( n^{2}-n+1 )
$

6. We can check: $u_{3} = (3+1)( 3^{2}-3+1 )=4*(9-3+1)=4*7=28$

7. Remark: Gauss addition formula: 1+2+3+....+n=n(n+1)/2

6 0

4 years ago

Read 2 more answers