Can someone please help me solve this. And graph it?

What is the area of the triangle 10 13 12

Adie is rolled, what is the probability of getting an even number or a 3? write the solution too

When adding 43.8 to a certain number, the sum is 46.59, as seen below. what number should go in the box to complete the addition problem? the decimal 43.8 is added to an unknown whole number and 79 hundredths to equal 46.59. numerical answers expected! answer for blank 1: