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  • 英文的數(shù)學(xué)題,請將每一步用英文解釋清楚

    英文的數(shù)學(xué)題,請將每一步用英文解釋清楚
    the total cost to use an in-flight phone on one airline includes a $3.99 connection fee plues $3.99 per minute .
    a,write a function rule for the cost of a call using an in-flight phone .
    b,find the cost of a 10-minute in-flight call .
    英語人氣:724 ℃時間:2020-03-30 16:16:43
    優(yōu)質(zhì)解答
    a,the cost of a call includes a 3.99dollar connection fee plues 3.99 dollar per minute,so the function rule for the cost of a call is y=3.99+3.99x (dollar) b.a 10-minute in-flight call cost y=3.99+3.99*10=43.89(dollar)
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