Solve this system of equations using substitution.

a + b + c = 180

b = 3a

c = 5a

Do the lengths 60,80,100 form a right triangle

Write an equation of a line whose graph is parallel to the graph of y=3x-10.

Andrew jogged for 50 minutes and covered a distance of 2.2 miles What is Andrew's speed in miles per hour? 1) 22.7 miles per hour 2) 2.64 miles per hour 3) 2.2 miles per hour 4) 1.83 miles per hour

A block of aluminum occupies a volume of 15.0 ml and weighs 40.5 g. What is it's density?

A roll of gift-wrapping paper can cover 232.2 sq. in. Jimmy wants to wrap a soccer ball that he is giving as a gift. What is the maximum radius of the ball that Jimmy can wrap? Use 3.14 for π.

How to convert millimeters to centimeters by dividing

Which of the following is an extraneous solution of square root - 3x-2=x+2? a) x = - 6 b) x = - 1 c) x = 1 d) x = 6

The measure of angle c is 70°. What is the measure of angle b

Why is 4 a natural number?

Students at university x must be in one of the class ranks, freshman, sophomore, junior, or senior. at university x, 35% of the students are freshmen and 30% are sophomores.