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3 years ago

I don't understand how to do this can someone please tell me the answer?:|

Mathematics

2 answers:

Sergeeva-Olga [200]3 years ago

7 0

I don't understand it either.

Sliva [168]3 years ago

4 0

2.2 times 3.3=7.26 because u just do it normally and move the decimal in twice because it's in two place values and there are 2 decimals so u move it twice to the left

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Can someone help me would the answer be x -2<br><img src="https://tex.z-dn.net/?f=%20%5Cgeqslant%20" id="TexFormula1" title=" \g

DerKrebs [107]

The answee is -2 < x < 10

6 0

2 years ago

Expand and simplify (2x + 3) (x + 7)

RUDIKE [14]

Answer:

$2x^{2} +17x+21$

Step-by-step explanation:

multiply the 2x by x and 7 and then multiply 3 by x and 7. you will get 2 $x^{2}$ +14x+3x+21. combine like terms so add 14x to 3x and thats the only like trerms in the equation. so 2x^2+17x+21

5 0

1 year ago

What is the average rate of change of f over the interval -1 on a separate sheet of paper and upload the work as a photo. Show a

Anarel [89]

Answer:

Average rate of change for the function $f(x)= x^2-x-1$ over the interval -1<x<1 is -1

Step-by-step explanation:

We need to find average rate of change of f over the interval -1 < x < 1

The function given is: $f(x)= x^2-x-1$

The formula used to find average rate of change is:

$Average\:rate\:of\:change=\frac{f(b)-f(a)}{b-a}$

We have, a = -1 and b = 1

Finding f(b) when b=1

$f(x)=x^2-x-1\\f(1)=(1)^2-(1)-1\\f(1)=1-1-1\\f(1)=-1$

Now, finding f(a), when a= -1

$f(x)=x^2-x-1\\f(-1)=(-1)^2-(-1)-1\\f(1)=1+1-1\\f(-1)=2-1\\f(-1)=1$

Now, putting values and finding average rate of change

$Average\:rate\:of\:change=\frac{f(b)-f(a)}{b-a}\\Average\:rate\:of\:change=\frac{f(1)-f(-1)}{1-(-1)}\\Average\:rate\:of\:change=\frac{-1-(1)}{1-(-1)}\\Average\:rate\:of\:change=\frac{-1-1}{1+1}\\Average\:rate\:of\:change=\frac{-2}{2}\\Average\:rate\:of\:change=-1$

So, average rate of change for the function $f(x)= x^2-x-1$ over the interval -1<x<1 is -1

4 0

3 years ago

when multiplie discount are used if an item is first discount by 40%,then again by 30%.then again by 10%,the final or cumulative

nadezda [96]

The answer is : 40+30=70
70+10=80 therfore the final or cumulative discount is 80%

4 0

2 years ago

60% of 30 can someone help

jeka94

the answer to ur question is 18

8 0

3 years ago