A group of neighborhood families are planning a trip to the museum. Tickets are $25 for adults and $10 for children. The group also has a coupon for $5 off. The expression 25a + 10c – 5
represents the total cost for a adult and c child tickets, Monica is purchasing tickets for
5 adults and 9 children.

Evaluate the expression to find the total cost.

25a + 10c - 5 = 25 ( _ ) + 10 ( _ ) - 5

ANSWER: $210

EXPLANATION:

The expression is 25a + 10c - 5 and what you need to do is just put in the number of adults and children into the expression.

a = number of adults

c = number of children

25 ( 5 ) + 10 ( 9 ) - 5 = 210          

the answers c

- "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."