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Elena L [17]
2 years ago
13

Ms. Molina was driving at a constant speed. She drove 150 miles in 3 hours. At that speed,

Mathematics
1 answer:
N76 [4]2 years ago
8 0

Answer:

450,500,225, and the speed is 50mph

Step-by-step explanation:

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What is solution 7x+5y=-24 and 4x+y=42?
LenKa [72]
7x+5y=-24 (1)
   4x+y=42 (2)

multiply equation (2) by 5 to get
20x+5y=210 (3)

then calculate (3)-(2) which gives you
13x=234 hence x=18
then substitute for x in either equation to get y=-30
6 0
3 years ago
Read 2 more answers
Cos90degrees cos30 degrees + sec-squared45degrees sin30degrees - cos270degrees sin180degrees
yawa3891 [41]

Step-by-step explanation:

\cos 90 \cos 30 + \sec^2 45 \sin 30 - \cos 270 \sin 180

But we know that

\cos 90 = \cos 270 = \sin 180 = 0

and

\sin 30 = \dfrac{\sqrt{3}}{2} \:\:\text{and}\:\: \sec 45 = \sqrt{2}

so this leaves us with just

\sec^2 45 \sin 30 = (\sqrt{2})^2  \left(\dfrac{\sqrt{3}}{2} \right)= \sqrt{3}

6 0
2 years ago
Which expression can be used to solve 3/5 ÷ 7/10​
marusya05 [52]

Answer:

Step-by-step explanation:

3/5 divided by 7/10

You use KCF

KCF stands for keep change flip

So it would be 3/5x10/7

3              10                    15

_      x       _        =            _

5               7                       7

you need to simplify it so the 5 in 3/5 would be a 1 and the 10 in 10/7 would be  5

5 0
2 years ago
What place value is this in 8.7438 the under lined number is 7​
MA_775_DIABLO [31]

Answer:

tenths place

Step-by-step explanation:

8 0
3 years ago
What is 56•80 equal
bazaltina [42]

Answer:

56*80=4480

Step-by-step explanation:

3 0
3 years ago
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