Answer:
<h2> Hey, Option C is correct.....</h2>
A=bh/2, h=b-5 so
A=(b/2)(b-5)
A=(b^2-5b)/2 and A=42 so:
(b^2-5b)/2=42
b^2-5b=84
b^2-5b-84=0
b^2-12b+7b-84=0
b(b-12)+7(b-12)=0
(b+7)(b-12)=0 and since b>0
b=12m
Answer:
x = -10
Step-by-step explanation:
First you have to isolate x
then you have to add 3 on the other side.
so yeahh!!
Answer:
45 280 63.640 880 20 54.640 60 60.610
750 076.8 4.360 0.6 95.2 810 130 322.5 0.4 606.1
Answer:
81
Step-by-step explanation:
(9x - 4)(9x + 4) = ax² - b
81x² - 36x + 36x - 16
= 81x² - 16
=> a = 81
