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3 years ago

What’s the answer but you also have to simplify

Mathematics

1 answer:

Jlenok [28]3 years ago

6 0

Answer:

The answer is 9x² + 3x - 2.

Step-by-step explanation:

1) Collect like terms.

$(7x^{2} + {2x}^{2} ) + ( - 2x + 5x) + (8 - 10)$

2) Simplify.

${9x}^{2} + 3x - 2$

Therefor, the answer is 9x² + 3x - 2.

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The class size increased 25% to 40 students. What was the original class size?

vladimir1956 [14]

The original class had 32 students. 25% of 32 is 8 and 32+8=40

6 0

3 years ago

Read 2 more answers

write in complete standard form then give the center and radius of each circle and graph the equation x2+y2-4x-12y-9=0

kakasveta [241]

Standard form;

(x - 2)² + (y - 6)² = 49

the center-radius form of the circle equation is in this format;

(x - h)² + (x - k)² = r²

so the center of the circle is; (2, 6)
so the radius of the circle is; 7

hope that helps, God bless!

8 0

4 years ago

a plumer charged x dollars per hour for a 3-hour job plus $125 for parts. the total charge for the service call was $305. which

marysya [2.9K]

Answer:

$60.00 /h

Step-by-step explanation:

y = mx + b

y, is the total charge

m, is the amount of money charged/h

x, is the number of hours

b, is the fixed rate

305 =m3 + 125

305-125 = m3

180/3 = m3/3

[60 = m]

6 0

4 years ago

What is the greatest possible error of 18.9? What is the greatest possible error of 11 1/8 oz?

VMariaS [17]

The greatest possible error of 18.9 is 18.95 - 18.85 = 0.1
The greatest possible error of 11 1/8 (11.125) oz is 11.1255 - 11.1245 = 0.001 = 1/1000

7 0

4 years ago

Suppose you have a bag containing 15 red beads, 12 white beads and 8 black beads. You are going to draw one bead out of the bag.

iren [92.7K]

Answer:

probability that you draw a black bead or a white bead that is P(E1 U E2)

= 20/35 = 0.571

Step-by-step explanation:

Given a bag containing 15 red beads, 12 white beads and 8 black beads

n(S) = 15 + 12 +8 = 35

Let 'E1 be the event of selecting black beads and E2 be the event of selecting white beads

n(E1) = 8 and n(E2) = 12

Probability of draw a black bead P( E1 ) = $\frac{n(E_{1} )}{n(S)}$

$P(E_{1}) = \frac{8}{35}$

Probability of draw a white bead P( E2 ) = $\frac{n(E_{2} )}{n(S)}$

$P(E_{2}) = \frac{12}{35}$

probability that you draw a black bead or a white bead that is P(E1 U E2)

and E1 n E2 = ∅ (disjoint events)

Axiom of union

$P(E_{1}UE_{2} ) = P(E_{1})+P(E_{2}) - P(E_{1}nE_{2})\\$

E1 n E2 = ∅ ⇒ P(E1 n E2) = p(∅) = 0

$P(E_{1}UE_{2} ) = P(E_{1})+P(E_{2}) - 0$

$P(E_{1}UE_{2} ) = \frac{8}{35} +\frac{12}{35}$

$P(E_{1}UE_{2} ) = \frac{20}{35}$

$P(E_{1}UE_{2} ) = 0.571$

8 0

4 years ago