Check out the refreshed revision resources for GCSE Maths: Changing the subject of a formula, with step-by-step slideshows, quizzes, practice exam questions, and more! The subject of a formula is the ...
A plumber charges £40 for a call out, and an extra £18 for every hour. How long did a job that cost £130 take? The formula for this plumber's charge is: \(T = £60 + £20 \times h\) where \(T\) is the ...
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