Which is a valid conclusion that can be drawn from these statements?

If a quadrilateral is a rhombus, then it is a parallelogram.

If a quadrilateral is a parallelogram, then its opposite angles are congruent.

The standard deviation for a set of data is 5.5. The mean is 265. What is the margin of error?

a blue arlin can swim at 50miles per hour. What is that speed in feet per second, to the nearest whole number?

The coordinates of the vertices of triangle ABC are A (-1,3), B (1,2) and C (-3,-1). Determine the slope of each side of the triangle and use that information to determine if the triangle is a right triangle or not.

Geoffrey spent 2 hours and 10 minutes studying for a test and 30 minutes working on a science project. How long did he spend doing homework?

What is the nearest tenth of. 8215?

I ran 13 miles in 2 1/4 hours. What was my average speed?

The tree house will be 8 feet off the ground. Peter will hang a rope, with knots tied for foot holds. Each knot uses an additional 2 inches of rope.

Using the information below, choose the correct answers. Amount: $125,000 Rate: 7.5 % Payments: 360 @ $874.02 Total Interest: $189,647.20 1. How much will be repaid for this loan? A. 189,646.53 B. 125,000.00 C. 314,647.20 2.

Find the LCM of this set of numbers. 135 and 225

Give an algebraic expression to the given verbal expression 1.) Twice the product of a and b 2.) The product of twice a and b