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Ksivusya [100]
3 years ago
7

HELP!! I desperately need help!! I would appreciate if you could show work please!!!

Mathematics
1 answer:
zzz [600]3 years ago
7 0

Answer:

a) 137.9°

b) 12.2° (please refer to explanation because I didn't know what to round to)

Step-by-step explanation:

1a) A supplementary angle will equal 180°, so you must subtract 42.1 from 180

180-42.1 = 137.9

1b) A complementary angle will equal 90°, so you need to use the expression given and add an x for the other part of 90°

8x-20+x = 90

9x-20=90

9x=110

x=12.2

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Question is in the picture please show work
postnew [5]

Answer:

D

Step-by-step explanation:

The m=3/4 when graph

6 0
3 years ago
Read 2 more answers
The sum of two numbers is 51.
Firdavs [7]

Answer:

21 and 30

Step-by-step explanation:

x + y = 51

x - y = 9

add the two equations and y's will cancel out

2x = 42  divide by 2

x = 21   so put 21 in for x in the top equation and solve

21 + y = 51

y = 30

4 0
2 years ago
1. A costume designer made 10 costumes that each used 5.8 yards of fabric. If she had 238.2 yards of fabric to start with, about
Zinaida [17]
 <span>You only need an estimate? Great. Think of the necessary material as 6 yards, so ten costumes would take 60 yards. Then think of the fabric on hand as 240 yards, so taking 60 yards away from that would leave [an estimated] 180 yards of fabric. 

For an equation, use: 

F" = F' - 5.8 C 

Where F' is the initial fabric stock, F" is the remaining fabric, and C is the count of costumes. 

In exact numbers, the formula works out to: 

F" = 238.2 - (5.8 * 10) 

F" = 180.2 

The estimate was very close. 

Good luck.</span>
4 0
3 years ago
Annie invests £9500 for 5 years in a savings account. She gets 1.8% per annum compound interest. How much money does Annie have
Trava [24]

Answer:

£10386.34

Step-by-step explanation:

The amount in an account for a principal P saved at compound interest for a period of n years at an annual rate of r% is calculated using the formula:

A(n)=P(1+r)^n

In this case:

Principal, P=£9500

r=1.8%=0.018

n=5 years

Therefore:

A(5)=9500(1+0.018)^5\\=9500(1.018)^5\\=\£10386.34

At the end of 5 years, Annie will have £10386.34

7 0
3 years ago
Y = 4x + 5 ; y = x - 4
liubo4ka [24]

Answer:

(- 3, - 7 )

Step-by-step explanation:

Given the 2 equations

y = 4x + 5 → (1)

y = x - 4 → (2)

Substitute y = 4x + 5 into (2)

4x + 5 = x - 4 ( subtract x from both sides )

3x + 5 = - 4 ( subtract 5 from both sides )

3x = - 9 ( divide both sides by 3 )

x = - 3

Substitute x = - 3 into either of the 2 equations and evaluate for y

Substituting into (2)

y = x - 4 = - 3 - 4 = - 7

solution is (- 3, - 7 )

8 0
3 years ago
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