An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 280 engines and the mean
pressure was 7.5 pounds/square inch (psi). Assume the population variance is 0.81. If the valve was designed to produce a mean pressure of 7.6 psi.
is there sufficient evidence at the 0.1 level that the valve does not perform to the specifications?

intensity of the vector is v= √37 ≈ 6.08 units and make angle ∡α ≈ 9.46° with east direction

step-by-step explanation:

required vector is consists of the two componentsvx= 2+4=6 units   and vy= 1 unit and vx ⊥ vywe will use pythagorian theorem to find intensity of the vector vv∧2 = vx∧2 + vy∧2 => v = √vx∧2 + vy∧2 = √6∧2 + 1∧2 = √36+1 = √37 ≈ 6.08 unitsthe angle ∡α between vector and east direction we wil find with tanαtanα = 1/6 => α = arc tanα = arc 1/6 => α ≈ 9.46°

hope this

the answer is b

-2x-4

step-by-step explanation: