Answer:
C) 
Step-by-step explanation:

13 + 23 · (19 - 7)
Do the parentheses first.
13 + 23 · (12)
Now do multiplication.
13 + 276 = 289
The answer is D) 289.
Answer:
a. 15/23
b. 13/27
c. 400g
Step-by-step explanation:
a. When the denominators are the same, you can just sum the numerators.
Which becomes, 13+2=15--> 15/23
b. Same, when the denominator is the same, you can just minus the numerators. Which becomes, 25-12=13--> 13/27
c. 1kg=1000g. 1000/5=200✖️2=400
Answer: 23/18
Step-by-step explanation:
The answer is A. After you square root both sides, you have to add 3 to both sides and then divide both sides by 4.