What is the image of (-3,-9) after a dilation by a scale factor of 1/2 centered at the origin

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Combine like terms to make a simpler expression 3z+z

In priyas math class there are 10 boys and 15 girls. what is the ratio of boys to girls in priyas math class? express your answer as a decimal