The aquarium has 10 more red fish than blue fish. 60 percent of the fish are red. how many blue fish are in the aquarium? show your work.

20

Step-by-step explanation:

Let be the number of red fish and the number of blue fish.

Set up the following system of equations:

You can substitute the first equation into the second equation:

And finally, you must solve for "x":

Blue fish = 20

Step-by-step explanation:

Let x be the number of blue fish in the aquarium.

The aquarium has 10 more red fish than blue fish.

Number of red fish = x+10

Total number of fished = x + (x+10) = 2x+10

It is given that 60 percent of the fish are red. It means number of red fishes is equal to 60% of total fishes.

Isolated variable terms of left side.

Divide both sides by -0.2.

Therefore, the number of blue fishes is 20.

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold

i think it would be 43 movies that would have to be watched.

step-by-step explanation:

think about it. for the second plan, every month is 8 dollars. 8 x 12= 96. so thats the number for the second plan. now for the first plan, its annual meaning you have to pay 10 dollars every year. so now you have to get an equivalent amount of 86 since 96-10=86. 86 divided by 2 since every movie costs 2$ then you would have to watch 43 movies a year to get the same as the second plan. i really hoped this . have a wonderful day as well!