Solve the system of equations using substitution.

2x+y=10

y=3x

Find the sum of the geometric series 1 + 0.8 + 0.8^2 + 0.8^3 + ... + 0.8^{19}

Subtract: - 1/6 - (-14/15) give your answer as a reduced fraction

A fishing boat travels 36 miles with the current of two hours. It travels 42 miles against the current in three hours

Sean is sending texts to his friends. The function y=160-x represents the number of characters y the message can hold after he has typed x numbers. Find the zero and explain what it means in the context of this sitaution.

If y = 6x - 4, which of the following sets represents possible inputs and outputs of the function, represented as ordered pairs?

Hiro has 5 kilog of potatos a 2 kg of onions he plans to use 3.25 kg of potatoes and 550 grams of onions for recipe. how many total kilograms of the produce will not be used?

The population of a country in 1950 was 6.2X10^7. The population in 2030 is projected to be 3X10^2 times the 1950 population. If the projection is correct, what will the population of the country be in 2030?

Browser ate 4 1/2 pounds of dog food that amount is 3/4 of the entire bag of dog food how many pounds of dog food were originally in the bag

Light from the sun can travel a million miles in 5.368 second how many seconds is that rounded to the nearest tenth of a second

Eric drove 113 miles on Monday. On Tuesday, he drove 33 miles less than Monday. How far did he drive both days?