Kayla's mom left a 20% tip for a restaurant bill that was $35. she used the expression 1.20(35) to find the total cost. which equivalent expression could she also use to find the total cost? a. 35 + 0.2 b. 1+0.2(35) c. 1.02(35) d. (1+0.2)35

Anyone know? will mark brainliest if you're correct!

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)