Explanation

If x - 1 is a factor of x² - kx + 3, then substituting x = 1 should make the expression zero.

Substituting x = 1 in x² - kx + 3 = 0 gives:

(1)² - k(1) + 3 = 0 ⟹ 1 - k + 3 = 0 ⟹ k = 4.

Explanation

To find the square root of 0.0676:

√0.0676 ≈ 0.26

Explanation

Speed = Distance ÷ Time

= 30 m ÷ 5 s

= 6 m/s

Explanation

An imperative sentence gives a command, request, or advice.

"Slow down before you get into an accident." is a command instructing someone to reduce speed.

Explanation

Mass number = Protons + Neutrons

Given 6 protons and 6 neutrons, the mass number is 6 + 6 = 12.

Explanation

Photosynthesis absorbs CO₂ from the atmosphere, reducing greenhouse gases.

Other factors like ozone depletion, greenhouse effect, and CO₂ increase contribute to global warming.

Explanation

0.0075m is correct because 7.5mm equals 7.5 ÷ 1000 meters.

Millimeters (mm) are converted to meters (m) by dividing by 1000.

One meter = 1000 mm

Explanation

Explanation

Positive feedback reinforces good behavior by rewarding or encouraging desired actions, increasing the likelihood of repetition.

It helps children develop confidence and motivation to continue engaging in appropriate behavior.

Explanation

"Is crying" is the correct present continuous tense.

It indicates an action happening at the moment.