Answer:
8 2/3
Y-E-E-T
Step-by-step explanation:
-78 divded by (-9)
-78
-----
-9
there are negatives on both sides. I don't know how to explain that but you can change it to a PLUS.
78/9
divide 3 on both sides
78/3 =26
9/3=3
26/3 now.
so the mixed number would be 8 2/3
level after I day was 5380 bacteria per cubic centimeter.
Answer: the function N(t) to estimate the level of contamination in the lake is:
N(t) = -1110 ln(t) - 230t + 1110 ln(I) + 230I + 5380
Step-by-step explanation: ∫ dN/dt dt = ∫ (-1110/t² -230) dt
N(t) = -1110 ln(t) - 230t + C
N(I) = -1110 ln(I) - 230I + C = 5380
C = 1110 ln(I) + 230I + 5380
Calculate:
a) the length, in cm, of the side AB on the map;
b) the length, in km, which represented by AD;
c) the area, in km², which represented by ΔADC.
The length of the side AB in cm is 9.45.
The length of the side AD in km is 1.02.
The area of ΔADC is 3.56 km².
The exterior angle of a triangle is sum of two opposite interior angles.
a)
The length of the side AB in cm on the map
∠B A C = 55 deg , ∠B C A = 77 deg
∴ ∠C A B is
We know the sum of all the interior angles of a triangle is 180 deg
So, ∠B A C + ∠B C A + ∠CAB = 180 deg
55° +77° + ∠CAB = 180 deg
∠C A B = 48°
∴ sin B= 7/AB
sin 48 deg = 7/AB
AB = 7/0.74
AB = 9.45 cm.
b)
The length of AD in km is
Again from interior angle theorem ∠ADC is
= 60 deg
So,sin 60 deg = 7/AD
0.86 = 7/AD
AD = 8.14 cm
∴AD in km is 1.02 k m s.
c)
The area of Δ ADC is
= 1/2 × AC × AD
= 1/2 × 7 × 8.14
= 28.5 cm²
So, the area in km²is
= 3.56 km².
Learn more about triangles here :
#SPJ2
Answer:
Siobhan makes $10.71
Step-by-step explanation:
9.00 + 40% = 12.60
Priya makes $12.60.
12.6 - 15% = 10.71
Siobhan makes $10.71
Brainliest Please!!