There are 4 boys for every 10 students in Ms. Day's math class. If there are 30 girls in her class, how many boys are there? (with explanation)

Simplify the following expression 20x^3y^2/5x^3y^5

Working alone, it would take Shandra 45 minutes to mow the lawn. To mow the same lawn, also working alone, it would take Kelly 1 hour and 15 minutes. If they work together, the girls believe it will take them 1 hour to mow the lawn.

Sammy buy an outfit for $65 if hr had a coupon for 20% off how much will his outfit cost after the discount has been aplied

X^2-8xy+16y^2 factor completely

Convert the fraction 7/8 into a decimal number.

When rounding a number, what should you do with the digits to the right of the place to which you are rounding

Trevor earns $7.80 an our take-home pay and works 20 hours each week to buy a new laptop computer to take to college that cost $780 how many weeks will it take for church to achieve his goal

What is each sum or difference? (7-2i) + (-3+i) (1+5i) - (3-2i) (8+6i) - (8-6i) (-3+9i) + (3+9i)

Si: P (x) = 3x; R (x) = 2x; calcula : P (R (0))

What is the missing number in 12,24,72,288