hello :
<span>Cot(pi/2-x)= tanx
</span><span>Cot(pi/2-x)/Cosx = tanx/cosx =tanx ×(1/cosx) = tanx ×secx
</span>because 1/cosx = secx
Answer:
u know area of rectangle is length × breadth
therefore, area = (3x+4)×(7x-2)
= 21x²-6x+28x-8
= 21x²+22x-8
= d ans
Answer:
(-20% + 5)(502-65) = 2097.6
Step-by-step explanation:
We know that
<span>A large pump can drain an 80,000 gallon pool------------> in 3 hours
X gallons---------------------------------------------------------> in 2 hour
X=2*80000/3----------> 53333.33 gallons in 2 hour
therefore
</span><span>the smaller pump in two hours drain an [80000-53333.33]=26666.67 gallons
</span><span>
if the </span>smaller pump drain 26666.67 gallons-----------------> in 2 hours
<span> 80000 gallons------------------------------------------------> X
X=80000*2/26666.67------> 6 hours
the answer is
</span><span>the smaller pump to drain the pool by itself would take 6 hours</span><span>
</span><span>
</span>
Hope this helps! The last one is all numbers because the one equation is already equal to the other equation.