Which regular polygon will not tessellate alone? pentagon, triangle, hexagon, square

How do I substitute equations

Albert could race 4 times as fast as Bernard. For this reason Albert could race 48 miles in 3 hours less than it took Bernard to race 30 miles. How fast could each of them race? What was the time of a racer?

How do you write 38/50 as a percentage?

Find the probability that in a family of 4 children there will be a. at least 1 boy b. at least 1 boy and at least 1 girl c. out of 2000 families with 4 children each how many would you expect to have 1 or 2 girls.

A rectangle's length is 4 more than twice its width. Its area is 240 square centimeters. Complete the work to find the dimensions of the rectangle.

The cake uses eggs and potatoes in a ratio of 2:5 if he uses 6 eggs how man pototoes will he need

If sally needs to make $799.99 dollars but she makes 5.00 a week for a allowance how many months will it take sally to get all the money?

One apartment costs $1000 a month with deposit off $1500. Another apartment costs 1175 a month with a 1200 deposit. how many months will it take to equal the same amount

Which is larger 0.076 or 0.08?

Simplify, if possible. log2 (0.5) 4