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Type: Posts; User: elizabeth

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    Thank you!:)

    Thank you!:)
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    Composite functions

    Composite functions SAT Subject test Math level 2

    Which of the following could be h(x) given that f(x)=x^2-3 and h(f(4))=24?

    (A) x+2
    (B) x+11
    (C) x+5
    (D) x-3
    (E) x-9
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    2,523

    Thank you!

    Thank you!
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    Trigonometry double angle formula

    Trigonometry double angle formula SAT Subject test Math level 2

    Which of the following is the value of \frac{5}{cos^22x- sin^22x } given that cos4x=\frac{1}{2}?

    (A) 5
    (B) \frac{1}{2} ...
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    thanks!!:)

    thanks!!:)
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    2,639

    SAT subject Complex zeroes

    Complex zeroes Subject test Math level 2
    Which of the following is a factor of P(x) given that 1+i is a zero of this polynomial?

    (A) 1+i
    (B) 1-i
    (C) x-(1+i)
    (D) x-(1-i)
    (E) -1-i
    ...
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    2,476

    Thanks oliver!

    Thanks oliver!
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    SAT math Remainder theorem

    Remainder theorem

    Which of the following is equal to the remainder left by the division of P(x)=2x^4-4x^3+3x^2-4x+8 by the linear polynomial x+2?
    (A) 88
    (B) 90
    (C) 92
    (D) 94
    (E) 96

    Thanks!
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    Properties of exponents (x^m)^n=x^{mn} ...

    Properties of exponents

    (x^m)^n=x^{mn}

    x^m x^n =x^{m+n}

    So, our expression is equal to

    (x^4)^5+(y^4) (y^5)=x^{4\cdot5}+y^{4+5}= x^{20}+y^{9}
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    This number can be written as...

    This number can be written as \frac{\sqrt4}{\sqrt7}}=\frac{2}{\sqrt{7}}=\frac{2\sqrt{7}}{7}

    Therefore the correct answer is (B).
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    2,957

    Thank you!!

    Thank you!!
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    sat math problem ratio

    If x and y are two positive numbers and x is 40% less than y, what is the value of the ratio x:y?


    (A) 0.4
    (B) 0.6
    (C) 1.4
    (D) 1.6


    Thanks:D
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    thank you!

    thank you!
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    sat math problem average

    25% of the officers in a camp are senior officers and the remaining are junior officers. The monthly wage of each senior officer is $4,500 and the monthly wage of each junior officer is $3,500. What...
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    Sum of two numbers

    The sum of two numbers is 14 and their product is 40. What is the value of the sum of their squares?

    (A) 116
    (B) 126
    (C) 196
    (D) 206

    Thanks!!
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    Thanks a lot for your reply!!;)

    Thanks a lot for your reply!!;)
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    2,157

    sat math question of the day

    If -4<a<1, then which one of the following is negative?
    (I) (a+4)(a-1)
    (II) (-4-a)(a-1)
    (III) (-4-a)(1-a)

    (A) I only
    (B) II only
    (C) III only
    (D) I and II only
    (E) I and III only
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    Thanks Kadence!!

    Thanks Kadence!!
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    sat math inequality question

    If x^2-4x>0, then which one of the following could NOT be the value of x ?

    (A) -2
    (B) -1
    (C) 1
    (D) 5

    Thanks!!;)
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    SAT math Factoring

    SAT maths question about Factoring

    Factoring or Factorising is the process of finding the factors of an expression.
    The following expression is called a difference of two squares...
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    SAT math Rules of Exponents

    SAT math Rules of Exponents

    If a,b are positive numbers, x,y are real numbers and m,n are positive integers then:

    1) a^{x+y}=a^x a^y Product Rule

    2) (a^x)^y=a^{xy} Basic Power Rule

    3)...
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    SAT math exponentials

    SAT math Exponential

    First take a look to this revision notes about Exponents

    http://www.ibmaths4u.com/Exponential%20and%20Logarithmic%20function.pdf

    Starting with 4^x=8

    square both...
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