16+2.4c=22.5 what does c equal?

Mathematics

2 answers:

Zepler [3.9K]3 years ago

7 0

Subtract both sides by 16 because u want to get the variable by itself then divide that by 2.4

Savatey [412]3 years ago

6 0

Rmember you can do anything to an equaiton as long as you it to both sides also x-x=0 and x times 1/x=1 and x times 1=x 16+2.4c=22.5 subtract 16 from both sides 2.4c=6.5 multiply both sides by 1/2.4 1c=2.708333333333333

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50+51+52+...+101=...<br>Can you help me? I do not understand

Dmitriy789 [7]

Suppose

$S=50+51+52+\cdots+100+101$

At the same time, we can write

$S^*=101+100+99+\cdots+51+50$

Note that $S=S^*$ (just reverse the sum). Let's pair the first terms of $S$ and $S^*$ , and the second, and the third, and so on:

$S+S^*=(50+101)+(51+100)+(52+99)+\cdots+(100+51)+(101+50)$

Now, each grouped term in the sum on the right side adds to 151. There are 52 grouped terms on that same side (because there are 50 numbers in the range of integers 51-100, plus 50 and 101), which menas

$S+S^*=52\cdot151$