I don't know how to find the value of the missing variable

Solve using substitution y=3x-4 2x+y=10

Solve for x: 5x + 15 = 28

An artist creates a right prism whose base are regular pentagons. He wants to paints the lateral surfaces of the prism. One can of paint can cover 30 ft2.

What is (4x+8) + (7x+3)

Jason eats 10 ounces of candy in 4 1/2 days. how many ounces does he eat per day?

If a single dice is rolled 3 times, how many different outcomes are possible?

Last week Kristen bought 5 pounds of apples this week she bought 1 half of that amount how many pounds of apples did Kristen buy this week

Zach has 53 flowers to plant. he wants to plant them in groups of 10s and 1. zach can plant 10 flowers in each flower box. He can plant 1 flower in each pot. How many different ways can zach plant flowers in boxes and pots

Jesse measures the water level from the top of a dock twice a day. The water level in the morning is 3 feet. The water level in the afternoon is 7.5 feet. Which statement about the relationship between the two measurements is true?

Charlotte has been working for her company for x years. Travis has been working for the same company exactly 3 years longer than Charlotte. What is the range of the relationship? A - y>0 B - y>3 C. y<3 D. 0