Answer:
sin75º=sin(30)º+45º)
=sin 30 cos 45+cos 30 sin 45
=1/2*√2/2+√3/2*√2/2
=√2/4+√6/4
=(√2+√6)/4
Check with calculator:
sin 75º≈0.9659
exact value=(√2+√6)/4≈0.9659
<span>Factor completely: 3x2 − x − 4
(3x-4)(x+1) FOIL method
3x2-4x+3x-4
-4x+3x= -1x= -x
</span><span> 3x2 − x − 4</span>
The answer is x^3
to solve such questions you just need to add exponents
Answer:
400
Step-by-step explanation:
Percentage decrease = 20% × 500
New value = 500 - Percentage decrease
500 - (20% × 500) =
500 - 20% × 500 =
(1 - 20%) × 500 =
(100% - 20%) × 500 =
80% × 500 =
80 ÷ 100 × 500 =
80 × 500 ÷ 100 =
40,000 ÷ 100 =
400
Answer:
I hope I helped sorry l didn't understand question number 19
