PLS HELP WILL MARK BRAINLIEST AND 30 POINTS!! Chris and Denisha are electricians.
Chris uses c=50h+65 to calculate how much he charges (c) in dollars for h hours of work.
Denisha uses d=37.50h+75 to calculate how much she charges (d) in dollars for h hours of work.
How much do Chris and Denisha charge per hour of work??

Chris charges $ per hour
Denisha charges $ per hour

Thank you!!

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

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If you are dealt 4 cards from a shuffled deck of 52? cards, find the probability that all 4 cards are diamondsdiamonds.