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7nadin3 [17]
3 years ago
11

ERROR ANALYSIS. Sandra drew the triangle. Rika said that the lengths couldn’t be correct. With which student do you agree? EXPLA

IN your answer.
Mathematics
1 answer:
suter [353]3 years ago
3 0

Answer:

Step-by-step explanation:

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I took a picture of the question
cluponka [151]

Answer:

27.5 inches^2

Step-by-step explanation:

Area of a triangle =

\frac{bh}{2}

Plugging in the equation,

\frac{11 \times 5}{2}   =  \frac{55}{2}  \\  \frac{55}{2}  = 27.5

7 0
3 years ago
Write the series using summation notation. Then find the sum of the series.
ivolga24 [154]

Hello, please consider the following.

\displaystyle 1+2+3+...+12=\sum_{k=1}^{k=12} {k}=\dfrac{12*13}{2}=6*13=78

For the second we will need to put on the same denominator.

\displaystyle \dfrac{1}{2}+\dfrac{1}{4}+...+\dfrac{1}{14}=\sum_{k=1}^{k=7} {\dfrac{1}{2k}}\\\\=\dfrac{1}{2}\dfrac{420+210+140+105+84+70+60}{5*7*3*2*2}\\\\=\dfrac{1}{2}\dfrac{1089}{420}\\\\=\dfrac{1089}{840}=1.296429...

Thank you.

3 0
3 years ago
Please help with the this give tiny explanation
Mila [183]

Answer:

21

first we begin from 1 to 100 we find 11 numbers contain 1 then we count 1s from 10 to 19 we get 9 numbers but there is an exciption in number 11 as it cotains 2 1s so thenumber of 1s is 21

5 0
3 years ago
The formula to find the area of the walls of a rectangular room is A=2h (l+b), h is wall height, l is room length, and b is room
Allisa [31]
Problems are very often written in a confusing way. This one couldn't possibly have been
written any more clearly.  Sooner or later, you have to stop telling yourself that you have
no clue, settle down, and carefully read the words that are right there on the page.

I'll tell you one more detail that's not in the problem:  "breadth" means "width".
 
Now.  The problem clearly tells you all of these things, in this exact order:

=>  Area of the walls = (2 x height) x (length + width)

=>  length = 8m
=>  width = 6m
=>  height = 2.5m 

Is there a reason you can't take the numbers for length, width, and height,
and write them in the formula for the area ?  Do I have to do all the work ?

Area = (2 x height) x (length + width)

Area = (2 x 2.5m ) x ( 8m    +   6m  )

Do the arithmetic inside the parentheses:

Area = (    5m     ) x (     14m          )

Do the multiplication:

Area = <u>70 m² .</u>

You will never see a problem that comes any closer to answering itself <em>for </em>you.
8 0
3 years ago
HELP ME PLZZZZZZZZZZZZZZZ
zhenek [66]

Step-by-step explanation:

g(f(x)) = f(x) substituted in g(x)'s function.

g(3x^2 - x - 8) = 3x^2 - x - 8 + 5 = 3x^2 - x - 3.

4 0
2 years ago
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