Henry has red marbles and blue marbles. The ratio of the number of his red marbles to the number of his blue marbles is 5:7. if Henry has 63 blue marbles how many red marbles does henry have? ___ red marbles -

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Sorry I havent been on. I've recently switched to Zoom Meetings.- (^:

He has 45 red marbles

Step-by-step explanation:

All you have to do is cross multiply and solve.

=

7 times x equals 7x. 5 times 63 equals 315.

divide both sides by 7

and x = 45

0.85 or 85%

step-by-step explanation:

1) divide 23 by 27

2) round the decimal to the nearest 10

3) so your answer would be 0.85 or 85%

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."