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

Aug 17, 2018

#1
+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   Aug 17, 2018
edited by CPhill  Aug 17, 2018
#2
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Thank you! I appreciate your help!  mathelp  Aug 17, 2018
#3
0

OK......   CPhill  Aug 17, 2018