Im having trouble with this question The ninth grade class has a ratio of 4 boys to 5 girls. If there are 630 students in the grade, how many are boys?

For which function is f (x) equal to f^-1 (x) ? a) f (x) = x+6/x-6 b) f (x) = x+2/x-2 c) f (x) = x+1/x-1 d) f (x) = x+5/x-5

Two-variable linear equations 2x - 5y = 20

It cost $9 to go pete's pottery place to make your own bowls for $3 per bowl. Natatlie goes to pete's pottery place and makes b bowls. She decides to make bowls 5 days this month so she can sell them at a craft fair

Which of these statements is true about autotrophs, but not heterotrophs? They use sugar and oxygen to make carbon dioxide and water. They use chlorophyll and oxygen to make carbon dioxide and water.

602 < 620 correct? Which way is greater than?

What expression is equivalent to - 1/3 (6x+15) - 3

Every month Paolo earns $40 for walking his neighbors dog after school. How much does he earn from this job in one year?

What's the standard form for 7 + (8 times 1-10)

Karen earns $8 per hour at her job. She has $300 saved in the bank. She wants to save at least $2,700 to buy a car.

Factor the common factor 1) - 36m + 16