Aconcrete brick measures 35cm by 15cm by 20cm. the dimensions of the inner 2 holes are 10x5cm
a . work out the cross - sectional area.
b. what is the volume of the brick?
c. how many litres of liquid concrete are needed to make the brick?

How do i multiply two digit numbers

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.

Joanie wrote a letter that was 1 1/4 pages long. katie wrote a letter that was 3/4 page shorter then joagies letter. how long was katies letter