Answer:
B) −2
Explanation:
When x is positive then y is positive integer.
When x is negative then y is negative integer.
<u>For Option A</u>
- y = -1 [x is negative so is y]
<u>For Option B</u>
- y = 1 [<u>x is negative</u> but <u>y is positive</u>]
<u>For Option C</u>
- y = 7 [x is positive so is y]
<u>For Option D</u>
- y = 9 [x is positive so is y]
15x²+16x+4 =0 (ax² +bx +c=0)
Δ = b²-4ac =256 - 4×15×4 =16
x1 = (-b+√Δ) / 2a = (-16+√16) / 30 =( -16+4) / 30 = -12/30 = - 2/5
x2 = (-b -√Δ) / 2a = (-16 -√16) / 30 = (-16 -4) /30 = -20/30 = -2/3
Please check the picture.
The decimal of 2.1 is greater than 2.0 but less than 2.42
<span>If you put the 9cm and 2cm rods together end-on-end, the new length is 11cm. Now if you repeat this with the 7cm and 5cm rods that new length is 12cm, so the difference between the two is now 1 cm. It does not seem very practical to walk around measuring items using the rods like this, so you could then make a small rod or use a strip of paper equal to the difference (1cm) as a standard measuring tool.</span>
