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Butoxors [25]
3 years ago
7

2. Find the value of the expression 21 – 2a if a = 3.

Mathematics
2 answers:
timama [110]3 years ago
7 0

Answer:

A

Step-by-step explanation:

we just substitute the value of "a" given in the above expression we get

21-2(3)

21-6=15

poizon [28]3 years ago
6 0

<u>Answer:</u>

<em><u>a. 15</u></em>

<u />

<u>Explanation:</u>

<u />

Step 1 - Input the value of 'a' in the expression.

21 - 2a

21 - 2(3)

Step 2 - Multiply two and three

21 - 2(3)

21 - 6

Step 3 - Subtract six from twenty one

21 - 6

15

Therefore, the value of the expression 21 - 2a if a = 3 is <u><em>a. 15.</em></u>

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3 years ago
Built in 2011, the capital gate tower is 150 meters tall (measured vertically from the ground) and makes a 72 degree angle with
Softa [21]

Answer:

Step-by-step explanation:

You can create a right triangle out of this information and then use right triangle trig to solve.

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7 0
3 years ago
I need help.like now please help me !!!!!!!!!
koban [17]
Use proportions for all of them, for #1 use the proportion 12/30 = 9/a based on corresponding sides and then cross multiply. a=22.5 For #2 use the proportion y/35 = 64/40 based on corresponding sides and then cross multiply, y=56 For #3 use the proportion 42/? = 54/36 and then cross multiply, ?=28
7 0
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