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avatar+156 

I am having a hard time with my math. Sorry. Please help me! Thank you. 

 Aug 17, 2018
 #1
avatar+98090 
+3

 

Hey...that's what we're here for...to help you  [if possible ]....!!!!

 

First one  : We know an opposite side to B  = 35   and the hypotenuse = 37

So....sin B  = 35 / 37

And we can use the  sine inverse  [arcsin ]  to  find B itself...so we have

 

arcsin (35/37 ] = B  ≈  71,07°

 

 

Second one

 

-1x^2 + 9x  = 6     subtract  6 from  both sides

-1x^2 + 9x  - 6 =  0    .....  a  =-1   b  = 9    c  = -6

 

So...the quad  formula  is     

 

-b  ± √ [ b^2  - 4ac ]                     -9 ± √ [ 9^2  - 4 (-1)(-6)]         -9 ± √ [ 81  - 24]

_______________     =             ___________________   =      ____________   =

       2a                                                    2(-1)                                   -2

 

 

-9 ± √ 57                 -9         √ 57               9            √ 57

_______   =            __  ±     ___   =         ___     ±   ___     

    -2                        -2            2                 2               2

 

 

 

Last one

 

Sign  in shape  of a rhombus with a 60° angle and sides of 7 cm

 

The area  =   7^2 * sin (60°)  ≈  49 * √3/ 2  =  (49/2)√​3  cm^2 = 42.4 cm^2

 

 

 

cool cool cool

 Aug 17, 2018
edited by CPhill  Aug 17, 2018
 #2
avatar+156 
+2

Thank you! I appreciate your help! smileysmiley

mathelp  Aug 17, 2018
 #3
avatar+98090 
0

OK......smiley smiley smiley

CPhill  Aug 17, 2018

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