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goldenfox [79]
3 years ago
9

I really need help please the c/4 is a fraction 85+c/4=99

Mathematics
2 answers:
Vadim26 [7]3 years ago
3 0

                                                 <u>85 + c/4  =  99</u>

Subtract 85 from each side:          c/4  =  14

Multiply each side by  4 :                 <em> c  =  56

</em>
erik [133]3 years ago
3 0
85+c/4=99

85+1/4c=99

1/4c+85=99

Subtract 85 from both sides.

1/4c+85−85=99−85

1/4c=14

Multiply both sides by 4.

4*(1/4c)=(4)*(14)

c=56

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What 1 thruogh 100 added up them divided
Marina CMI [18]
We can use the sum of an aritmetic sequence
the sum from n=1 to n=r when the first term is a1 and the nth term is an is
S=\frac{n(a_1+a_n)}{2}
first term is 1
last term is 100
there are 100 terms so n=100

so the sum is S=\frac{100(1+100)}{2}
S=(50)(101)
S=5050
now you want us to divide by 10
5050/10=505


fun fact, gauss (famous math guy) did this when he was younger, legend has it that he was assigned this as an in class assigment to kill time but gauss found a neat pattern, he noticed that adding the end terms wer giving the same sum, example, 100+1=101, 2+99=101, etc, so he just needed to find al the pairs and add them all up




answer is 505
the result is 505
5 0
3 years ago
What’s 4+5+6+7+8. Plzzzzzzzz
irina1246 [14]

<em><u>It's 30</u></em>

<em>Hope that helped!</em>


8 0
3 years ago
Read 2 more answers
Solve 15x+3y=9,10x+7y=-4
TiliK225 [7]

Answer:

x = 1, y = -2

Step-by-step explanation:

15x + 3y = 9 (1)

10x + 7y = -4 (2)

3 × (2) - 2 × (1)

3 × (2)

30x + 21y = -12 (3)

2 × (1)

30x + 6y = 18 (4)

(3) - (4)

15y = -30

y = -30 / 15

y = -2

sub y = -2 into (1)

15x + 3y = 9

15x + (3 × -2) = 9

15x - 6 = 9

15x = 9 + 6

15x = 15

x = 15 / 15

x = 1

4 0
3 years ago
I need help in my math homework
IRINA_888 [86]
All you do is subtract the two numbers
4 0
3 years ago
Find the value of 45\75=5
liubo4ka [24]

Answer:

.6

Step-by-step explanation:

7 0
3 years ago
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