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katrin [286]
1 year ago
11

In a certain school 70% of the students in first-year chemistry have had algebra. If there are 290 students in first-year chemis

try, how many of them have had algebra?
Mathematics
1 answer:
KiRa [710]1 year ago
4 0
Seventy percent of 290 is 203
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Write an equation<br> write an solution<br> and do a check step
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what is one easy addition equation?

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I need help and I SUCK at mathematics can yall help me I'm in 5th grade​
nalin [4]

Answer:

C

Step-by-step explanation:

1 1/4 = 1.25

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F(x)=2x^2+3 and g(x)=x^2-7 find (f+g)(x)
defon

Answer:

3x^2 -4

Step-by-step explanation:

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I like to line them up vertically

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3 0
2 years ago
A student has some $5 bills and $10 bills in her wallet for a total of $100. The amount of $10 bills she has is 3 more than 3 ti
Sergeu [11.5K]

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Using t=tanx/2, write an expression for sinx and cosx in terms of t.
Dafna11 [192]

Assume 0 < <em>x</em>/2 < <em>π</em>/2. Then

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===>   cos(<em>x</em>/2) = 1/√(1 - tan²(<em>x</em>/2))

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We also know that

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Recall the double angle identities:

cos(<em>x</em>) = 2 cos²(<em>x</em>/2) - 1

sin(<em>x</em>) = 2 sin(<em>x</em>/2) cos(<em>x</em>/2)

Then

cos(<em>x</em>) = 2/(1 - <em>t</em> ²) - 1 = (1 + <em>t</em> ²)/(1 - <em>t</em> ²)

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