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susi
susi asked in Science & MathematicsMathematics · 7 years ago

maths questions pleaseee help?

solve 7(x+2)=7

simplify a4xa5

simplify 45e6 f8/ 5ef2

write down the value of 9 1/2

write 0.000376 in standard form

write 8.2x105 as an ordinary number

please show the working out for all

2 Answers

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  • Brainard
    Lv 7
    7 years ago

    1) solve 7(x+2)=7

    Divide both sides by 7

    x + 2 = 1

    x = 1 - 2

    = - 1

    2) simplify a4xa5

    Add the exponents for multiplication

    a4xa5 = a^(4+5) = a^9

    3)simplify 45e6 f8/ 5ef2

    45e6 f8/ 5ef2 = (45/5)*(e^6/e)*(f^8/f^2)

    = 9 * e^(6-1)*(f^8-2) ......... subtract exponents for division

    = 9e^5f^6

    4) write down the value of 9 1/2

    Is this 9(1/2) or (91)/2?

    9(1/2) = 9.5 (91)/2 = 45.5

    5) write 0.000376 in standard form

    3.76 x 10^-4

    6) write 8.2x105 as an ordinary number

    820000

  • MICHAEL K
    Lv 7
    7 years ago

    7(x + 2) = 7

    7x + 14 = 7

    7x = - 7

    x = - 1.

    and

    a^4 x a^5 = a^9.

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