Maria went to the restaurant to buy a hamburger and a drink. she used to pay $6.00, but the price went up to $6.50. what percentage was her meal marked up?

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.