Q4, 4y²=60
y=√15 ( i am not sure)
q6, (5+y) ²=81
5+y=9
y=4
q7 (x+4) (x) =77
x²+4x-77=0
(x+11) (x-7) =0
x=-11(rej) or x=7
therefore ,length= 7+4=11cm
breadth=7cm
It would be 46 for the salary and for the income would be 35 because if u subtract that and then divide it u get 50
The answer is 29% first you subtract the first number by the second number then make a fraction with the difference and the second number then make a decimal and make a percent out of that decimal
The equation 2cos^2(x) - 1 = 0 we manupulate by adding 1 to both sides and then dividing both sides by 2.
2cos^2(x) - 1 = 0
2cos^2(x) = 1
<span> cos^2(x) = 1/2
</span> cos(x) = ±√1/2
<span> cos(x) = ±√(2)/2 </span>
The answers to your question are <span>A. 3pi/4, B. 15pi/4, and D. </span>-7pi/4 as they all are angles with a reference angle of pi/4. They will have a cosine ratio of <span>√(2)/2 or </span><span><span>-</span>√(2)/2</span>