Rick bought some tetra fish and goldfish for his fish tank. he bought twice as many goldfish as he did tetras. each goldfish costs $1.50, and each tetra fish costs $2.00. he spent $20 on the fish. which system can be used to represent x, the number of tetra fish, and y, the number of goldfish, he purchased?

2x = y

2x + 1.5y = 20

Step-by-step explanation:

x represents the number of tetra fish

y represents the number of goldfish

Rick bought twice as many goldfish as he did tetra so multiply 2 by the number of tetra fish to get the number of goldfish or 2x = y

Tetra fish cost $2.00 each

Goldfish cost $1.50 each

Rick spent $20 on fish so $2 multiplied by number of tetra fish + $1.50 multiplied by number of goldfish will equal $20 (total spent on fish) or

2x + 1.5y = 20

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.