What substitution should be used to rewrite 4x4 - 21x2 + 20 = 0 as a quadratic equation?

u = x2

u = 2x2

u = x4

u = 4x4

Complex numbers are used in electronics to describe the current in an electric circuit. Ohm's law relates the current in a circuit, I, in amperes, the voltage of the circuit, E, in volts, and the resistance of the circuit, R, in ohms, by the formula

The table shows the amount that each person spend on snacks, games, and souvenirs the las time they went to the carnival. Sinea - snacks $5 / games $8 / souvenirs $12 Ren - snacks $10 / games $8 / souvenirs $20 A.

Identify the volume and surface area of a sphere with great circle area 225π ft2 in terms of π. A: V = 4500π ft3; S = 900π ft2 B: V = 900π ft3; S = 300π ft2 C: V = 900π ft3; S = 4500π ft2 D: V = 300π ft3; S = 900π ft2

How can you use and compare data to solve real-world problems?

One-third of the dairy cattle on a farm are in the barn. Three-fifths of the beef cattle are in the barn. There are 30 dairy cattle and 15 beef cattle in thr barn. How many more dairy cattle are on the farm than beef cattle?

What times two equals 28

This year the cost of a pair of tennis shoes is 35% higher than it was last year. What percent of last year's price is this year's price?

Order the values from greatest to least |-1/2|,|-2/3|,|-1/10,|0|

Which graph best represents y=3 (x-3) ^2+3

Find the solution to the system y = - 2x + 1 and y = x-5