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Write a proportion for each situation. Then solve
c. 25 yards in 2 1/2 seconds 100 yards in y second

d. 480 heartbeats in 4 minutes z heartbeats in 1 minute​

Respuesta :

mhanifa

Answer:

  • c. x = 10
  • d. z = 120

Step-by-step explanation:

Given proportions

Equations as per ratio and solution for each

c. ..................................

  • 25 ÷ 2 1/2 = 100 ÷ x
  • 25 ÷ 5/2 = 100 ÷ x
  • x = 100×5/2÷25
  • x = 10

100 yards in 10 seconds

d. ..................................

  • 480 ÷ 4 = z ÷ 1
  • 120 = z
  • z = 120

120 heartbeats in 1 minute

ricchad

Answer:

c.   y = 10 secs.

d.   z = 120 heartbeats

Step-by-step explanation:

c.  ratio and proportion:

25 yards   =    100 yards

  2.5 sec.             y sec.

cross multiply:

100 (2.5) = 25 (y)

simplify:

y = 250 / 25

y = 10 secs.

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d.  ratio and proportion:

480 heartbeats =    z heartbeats  

     4 mins.                      1 min.

cross multiply:

4 (z) = 480 (1)

simplify:

z = 480 / 4

z = 120 heartbeats

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