(6 and one-half + 2 and three-fourths) minus 1.5 times (4.5 divided by 0.5)Step 19 and one-fourth minus 1.5 times (4.5 divided by 0.5)Step 27.75 times (4.5 divided by 0.5)Step 37.75 times 9Step 469.75Where did Cecilia make her first mistake?step 1step 2step 3step 4

correct answer is b. 27/8

step-by-step explanation:

x = 12

y = 1

for the points!

7.9m and 4.3°

step-by-step explanation:

let east be +x and north be +y, x = distance * cos θ, y = distance * sin θ  

for 3.5 south, y = -3.5  

for 8.2, x = 8.2 * cos 30 and y = 8.2 * sin 30  

for 15 west, x = -15  

total x = 8.2 * cos 30 – 15 ≈ -7.9  

total y = -3.5 + 8.2 * sin 30 = 0.6  

magnitude = [(8.2 * cos 30 – 15)^2 + 0.6^2)]^0.5  

the magnitude is approximately 7.9 m  

tan θ = y/x = 0.6/-7.9  

the angle is approximately 4.3˚ north of west